Using sunscreen daily harmful to your skin

Question

Is the daily use of sunscreen harmful to your skin barrier because it blocks sun rays from giving people the Vitamin D they need? Please let me know as someone who values skincare.

Comments

This claim is seemingly false, wearing sunscreen daily is essential to your skin barrier. According to the American Academy of Dermatology wearing sunscreen daily helps prevent harmful sun rays harm your skin. The AAC by giving examples on how wearing sunscreen can benefit you, "reduce your risk of developing skin cancer," "decrease signs of early aging on your skin like wrinkles, age spots, and sagging skin," and "Prevent sunburn" help us understand how use of daily sunscreen is not harming our skin but doing the opposite.

https://www.aad.org/public/everyday-care/sun-protection/shade-clothing-sunscreen/is-sunscreen-safe#

---

Great response, concise but hits the nail on the head. Also uses a very reputable source. Keep it up!

---

I believe that sunscreen is more effective than harmful, but I think there is some truth to certain sunscreens with chemicals causing irritation. I am curious about what specific sources were used to back up these claims.
According to Cancer Council, "Reactions to sunscreen are rare and can be a result of a sensitivity or allergy to any of the many ingredients used in these products. Some people may have a reaction to a fragrance, preservative, UV absorber, or another component of the sunscreen."

https://www.cancer.org.au/cancer-information/causes-and-prevention/sun-safety/about-sunscreen/sunscreen-reactions

---

I like your standpoint on this claim. You provide well sourced evidence, such as the American Academy of Dermatology. You also explain the facts you found from the sources, which is helpful for factchecking.

---

I agree with your factcheck. I liked how you cited what source you were using, and explained what the American Academy of Dermatology stated. I do know that some sunscreens contain ingredients that can be harmful, and I think it would beneficial to include more on that because knowing about both sides of the claim can help further reveal how accurate this claim is. I would also like to know more about the American Academy of Dermatology and how that is a credible source. Overall, I really like your factcheck and I think you included helpful information.

---

This claim seems to be false, this is because according to Harvard Health Publishing "Concern about vitamin D deficiency should not be a reason to avoid sunscreen." It is also said said that some sunscreens contain a chemical that is an apparent hormone blocker called "Oxybenzone". This is nothing to worry about though, as testing was done to see the affects of this chemical. After studies done on rats using the chemical, it is said "It would take an individual 277 years of sunscreen use to achieve the equivalent systemic dose that produced effects in these rat studies,". https://www.health.harvard.edu/staying-healthy/the-science-of-sunscreen

---

Based on my research, the claim that “using sunscreen daily is harmful to your skin” is false. Here’s what I found:

First of all, a Q&A site like Quora.com is not a valid source as the information comes from individual users instead of licensed professionals. After a quick google search of the main claim “Is using sunscreen daily harmful to your skin?” I found multiple sources that prove that daily sunscreen is in fact crucial to protecting your skin from the harmful rays of the sun.

The first reliable source I found was an article from the American Medical Association called “What doctors wish patients knew about wearing sunscreen”. The AMA is a licensed organization with educated professionals in varying medical fields, with this article focused on statements from two dermatologists.

- Evelyn Jones, MD, a dermatologist and owner of WellSprings Dermatology and WellSprings SkinCare in Paducah, Kentucky.

- Klint Peebles, MD, a dermatologist in Washington and suburban Maryland at Mid-Atlantic Permanente Medical Group, a member of the AMA Health System Program.

The article lists multiple points on how to properly choose, apply, and reapply sunscreen. The first sentence of the article, “wearing sunscreen is one of the easiest ways to protect your skin’s appearance and health at any age,” already disproves the initial claim, with the article then going into more detail about how wearing sunscreen helps to prevent skin cancer.

Although this article is from 2022, meaning that it isn’t the most recently posted evidence, it is still a reliable source. If this claim was about politics or current events, an article from three years ago might not be the best evidence to use, but facts proven by medical professionals and dermatologists are still reliable after three years.

In addition, I investigated “The science of sunscreen” published by Harvard Health, yet another incredibly reliable source backed up by professionals of a prestigious university and medical school. Dr. Jennifer Lin, an assistant professor of dermatology at Harvard Medical School and co-director of the Melanoma Risk and Prevention Clinic at Brigham and Women's Hospital answers commonly asked questions about sunscreen. This article states the many benefits of wearing daily sunscreen, but it also addresses some potential worries that people have about sunscreen.

There is a question asking “Is there evidence that sunscreen actually causes skin cancer?” in which Dr. Lin replies with a no, stating that those who use more sunscreen are also the ones who are exposing themselves to more of the suns harmful rays. This means that there is a direct correlation from sun exposure to skin cancer, not sunscreen to skin cancer.

https://www.ama-assn.org/delivering-care/public-health/what-doctors-wish-patients-knew-about-wearing-sunscreen

https://www.health.harvard.edu/staying-healthy/the-science-of-sunscreen

---

This comment seems to be seemingly false. Daily sunscreen is essential for protecting your skin from harmful ultraviolet radiation, which can lead to skin cancer and premature aging. There are many concerns about sunscreen damaging the skin barrier or causing vitamin D deficiency are common, but current research provides evidence against those common claims.
An article published in the journal Life showed the effects of sunscreen on various parameters of skin health, including transepidermal water loss, stratum corneum hydration, and skin elasticity. The findings indicated that sunscreen use does not affect the skin barrier function or overall skin homeostasis.
https://www.mdpi.com/2075-1729/12/12/2083?
While it's true that UVB rays from the sun are necessary for the skin to create vitamin D, research indicates that regular sunscreen use does not lead to vitamin D deficiency. Research has shown that people who use sunscreen daily can maintain healthy vitamin D levels.
https://www.skincancer.org/blog/sun-protection-and-vitamin-d/?
In summary, sunscreen use is a vital component of keeping a healthy skincare routine, protecting against UV damage without harming the skin barrier or significantly inhibiting vitamin D. Balancing sun protection with mindful vitamin D intake through diet or supplements can help you keep overall health while protecting your skin.

---

The claim that using sunscreen daily is harmful to your skin because you are blocking the sun rays is false. Wearing sunscreen daily is proven by dermatologists that it is essential to your skin barrier. “Contrary to common concerns, research indicates that the regular use of sunscreen does not significantly impair the body’s ability to produce vitamin D.” (Bask Sunscare). According to the American Academy of Dermatology, wearing sunscreen helps prevent harmful sun rays from harming your skin. AAD gives examples on sunscreens' benefits such as decreasing signs of early aging, decreasing risk of developing skin cancer, and preventing sunburn. It is important to note that while sunscreen significantly lowers the exposure to UVB rays, it does not block all 100%. This is backed up by Bask Suncare unveiling-the-truth-does-sunscreen-block-vitamin-d, the AAD https://www.aad.org/public/everyday-care/sun-protection/shade-clothing-sunscreen/is-sunscreen-safe#, and NIH uvfilters. Daily use of sunscreen is not harming our skin, but doing the opposite!

---

Great response that gets straight to the point. Also uses a very reputable source. Keep it up! The main question that this claim gives rise to is are there any differences between the different sunscreen brands and if they have an effect?

---

This claim is not true. Sunscreen is something healthcare professionals suggest you wear every day. Sunscreen does not block your skin from obtaining good vitamins such as vitamin D but does block your skin from harmful UV rays that hurt you. In research done by AMA, Johns Hopkins Medicine, and  Harvard Health, sunscreen is something that should be a part of your daily routine. It benefits your skin by reducing the risk of skin cancer and helping your skin stay as healthy as possible when spending time outdoors. Your body is still able to take in Vitamin D while being protected from Ultra ultraviolet rays that can burn your skin. In a study done by Harvard Health it states, "but there's debate about whether this is actually necessary when vitamin D can be obtained from certain foods and as an oral supplement. Concern about vitamin D deficiency should not be a reason to avoid sunscreen." (Harvard Health). Ultimately this claim is false.

Sources: https://www.health.harvard.edu/staying-healthy/the-science-of-sunscreen

https://www.ama-assn.org/

Answer 1

No, using sunscreen daily is not harmful to your skin. 

According to M.D. Anna Lien-Lun Chien, "Wearing sunscreen is one of the best — and easiest — ways to protect your skin’s appearance and health at any age. Used regularly, sunscreen helps prevent sunburn, skin cancer and premature aging.

To help make sunscreen a part of your daily routine, dermatologist Anna Chien addresses common concerns."

https://www.hopkinsmedicine.org/health/wellness-and-prevention/sunscreen-and-your-morning-routine#:~:text=Wearing%20sunscreen%20is%20one%20of,Anna%20Chien%20addresses%20common%20concerns.

Comments

While your fact-check emphasizes the importance of sunscreen in preventing skin cancer and premature aging, it would be beneficial to acknowledge and address the common concern regarding vitamin D synthesis. Many individuals worry that daily sunscreen use might impede their body's ability to produce sufficient vitamin D. By incorporating information from reputable sources, such as the Skin Cancer Foundation, which states that typical sunscreen use does not significantly decrease vitamin D levels, you can provide a more balanced perspective. This approach not only reinforces the importance of sun protection but also alleviates concerns about potential vitamin D deficiency.

---

This fact check is reliable and uses a good source as evidence. However, it's always beneficial to use more than one source to strengthen your fact-check and to ensure that your information is consistent across multiple sources. Also, it would be helpful to include information about how sunscreen affects vitamin D levels, as that is an area of concern in the original claim.

---

Your fact check was good, you answered the question on whether or not sunscreen every day is good for your skin, however to make your answer great you could acknowledge the question surrounding how sunscreen affects getting vitamin d.

---

I think this is a strong response, I'm glad you included the direct quote from John Hopkins. I think highlighting Dr. Anna Chien’s credentials and making it clear that regular sunscreen use is not only safe but one of the most effective ways to protect long-term skin health. If I were to add anything I would consider that modern sunscreens are formulated to minimize irritation and clogged pores, addressing some of the most common concerns people have about daily use. Overall, great job debunking this myth with evidence-based information.

---

The claim "using sunscreen daily is harmful to your skin" is false. To start, the link provided took me to Quora. Quora is known to be an unreliable website where people can post their "hot takes." Additionally, when I went to the website, the first statement that popped up was "Yes, there can be such a thing as "too much" sunscreen, but it's important to clarify what that means. Here are some key points: Application Amount: The general recommendation is to apply about 1 ounce (about a shot glass full) of sunscreen to cover the entire body. Applying less than this can significantly reduce its effectiveness." The claim stated that using it every day was harmful, it was never about the amount being used. Sunscreen does not block your skin from receiving vitamin D. According to the National Library of Medicine, sunscreen is efficient at blocking UV rays if used correctly but does not block vitamin D from your skin. "Thus the review concludes that sunscreens can be effective in preventing erythema from solar exposure without limiting the benefits with respect to vitamin D production. However, populations that avoid solar exposure for cultural or medical reasons should be screened for vitamin D deficiency and treated appropriately with supplementation." Vitamin D deficiency most often occurs based on sunlight exposure, not because of sunscreen. Healthcare professionals highly advise individuals to wear sunscreen every day. Another statement found on the Quora website highlights "Reapplication: Sunscreen should be reapplied every two hours, or more frequently if swimming or sweating. Over-applying in a single session doesn’t increase protection." There is no real claim stating that it is harmful to use every day, the claim being stated is that it is not going to be more effective just because someone applies more sunscreen in one session. Quora should not be a website for individuals to trust fully. You should always factcheck something from websites you know may provide false information. Contrasting, an article I found by Cleveland Clinic states "In general, wearing sunscreen daily can help build up your skin’s protective barrier. Even when you’re out and about for a quick walk, the sun’s rays can still get to you. Wearing daily sunscreen is the easiest way to avoid harmful UV (ultraviolet) rays and prevent any surprise sunburns or skin irritation." There are numerous studies and reliable articles arguing that sunscreen should be worn every day! Sun exposure can be beneficial in reducing acne, rosacea, and providing your skin with vitamin D. Sunscreen should absolutely be a part of everyday routine to also reduce chances of getting skin cancer. One last article I reviewed by John Hopkins Medicine explains "UVB rays are responsible for sunburns and skin cancer. There are two other portions of UV light: UVC rays (which don’t pass the earth’s atmosphere) and UVA rays (which are also responsible for skin cancer as well as skin aging). A sunscreen that is broad spectrum will protect against both UVB and UVA rays." Wearing sunscreen is super easy and can be extremely beneficial to start using every day to protect your skin. Overall, the claim of sunscreen being harmful is false. There is no evidence in the claim that proves this statement to be true. The link provides no real evidence as to why they may be beneficial. Overapplying sunscreen may not increase protection against sunrays, but it does not harm your body to add more.

https://www.quora.com/Is-there-such-thing-as-too-much-sunscreen
https://pmc.ncbi.nlm.nih.gov/articles/PMC9002342/
https://www.hopkinsmedicine.org/health/wellness-and-prevention/sunscreen-and-your-morning-routine
https://health.clevelandclinic.org/why-you-should-wear-sunscreen-every-day

Answer 2

I disagree with the statement that using sunscreen daily is harmful to your skin.

According to American Medical Association, "Wearing sunscreen is one of the easiest ways to protext your skin's appearance and health at any age. But more often then not, people are not wearing - or reapplying - sunscreen properly. Knowing what type to buy and how to propely apply sunscreen are key to preventing skin cancer, which is often caused by too much exposure to ultraviolet rays from the sun or artifical sources such as tanning beds". 

https://www.ama-assn.org/delivering-care/public-health/what-doctors-wish-patients-knew-about-wearing-sunscreen

Comments

The AMA source is great for emphasizing the importance of sunscreen, but including specific statistics or studies could strengthen your argument. One thing I think you could touch on is the vitamin D discussion. Like briefly mention that while sunscreen blocks UVB rays, which are needed for vitamin D synthesis, most people get more than enough incidental sun exposure without risking skin damage. So, while it’s important to protect our skin from harmful rays, it’s still possible to maintain vitamin D levels through diet or supplements.

---

I agree with your fact-check about sunscreen being crucial for protecting against skin cancer and premature aging. Another thing that could be mentioned, is the concern people often have about sunscreen blocking vitamin D production. A lot of people worry that using sunscreen every day might prevent their body from getting enough UVB rays for vitamin D. But studies, like those from the Skin Cancer Foundation, show that regular sunscreen use doesn’t significantly affect vitamin D levels. Including that info could help ease some of the concerns people have, while still reinforcing how important sunscreen is for skin health. Overall, great job!

---

Your answer highlights the importance of sunscreen in protecting skin health and preventing skin cancer. Citing the American Medical Association adds credibility, and emphasizing common mistakes like improper application and lack of reapplication helps identify why sunscreen use is often ineffective.

---

While I agree with your factcheck disproving the original claim and providing an article about why sunscreen is important, I think it would be a stronger claim if you also addressed the concern about vitamin D. I think that the most convincing claim would address both parts of the question. I do appreciate that you cited the American Medical Association because that is a reliable source. If you wanted to take it one step further, you could even find an article from AMA that was published more recently.

Answer 3

Research indicates that the claim that too much or daily sunscreen can block people from receiving adequate Vitamin D from the sun is largely unfounded and disproved by research. 

While sunscreen does block some UVB rays, which is where this myth comes from, it still allows enough rays to reach the skin to support Vitamin D production. Research published in the National Library of Medicine states, "There is little evidence that sunscreen decreases 25(OH)D concentration when used in real-life settings, suggesting that concerns about vitamin D should not negate skin cancer prevention advice."

https://pubmed.ncbi.nlm.nih.gov/30945275/

Additionally, the benefit of daily application of sunscreen far outweighs any potential risk. According to the Skin Cancer Foundation, "unprotected sun exposure puts you at risk for any number of conditions that can permanently damage your skin, disfigure you, sometimes even kill you. And the regular use of sun protection can go a long way to keep any of that from happening."

https://www.skincancer.org/blog/sun-protection-and-vitamin-d/

Comments

Great fact check! I like that you included multiple sources, including a government website, and that you went a step further to prove your claim that daily use of sunscreen is not harmful, and instead beneficial, by using information from the Skin Cancer Foundation about the importance of sun protection.

---

This is a great fact-check! You used multiple sources and addressed all parts of the claim, providing evidence that sunscreen does not affect vitamin D production and that it's beneficial to the skin barrier. However, one suggestion I have is to make sure you are linking a primary source - for your second source you linked a blog, which cited from the Skin Cancer Foundation. Instead of citing the blog, it would be better to get your information directly from the Skin Cancer Foundation, as information from a primary source is more reliable and you can make sure you are reading the full story, blogs can be written by anyone and are not always reliable.

Answer 4

This claim is false, daily sunscreen wear is not harmful to your skin. According to Harvard Health, sunscreen does not cause skin cancer and does not contain harmful ingredients. Although sunscreen blocks UVB rays, the article explains that most people don't apply enough sunscreen to cause a deficiency in Vitamin D. Sunscreen, when applied and re-applied correctly, contributes to skin cancer protection and even aging effects.

https://www.health.harvard.edu/staying-healthy/the-science-of-sunscreen

Answer 5

I have found this claim to be false. Upon researching on the American Medical Association’s (AMA) official website, an article I found states “The UVL rays cause damage to our skin cells increasing the risk of skin aging and skin cancer. Using sunscreen on a daily basis is critical to protect the skin cells from this damage.” This goes to show that wearing sunscreen everyday is very effective in protecting the skin barrier. This is true even for cloudy days!

https://www.ama-assn.org/delivering-care/public-health/what-doctors-wish-patients-knew-about-wearing-sunscreen#:~:text=%E2%80%9CThe%2520UVL%2520rays%2520cause%2520damage,will%2520penetrate%2520through%2520the%2520clouds.%E2%80%9D

Answer 6

According to Dr. Henry W. Lim, chair emeritus of the department of dermatology at the Henry Ford Health System and former president of the American Academy of Dermatology, using sunscreen could lead to vitamin D deficiency but in only very extreme cases in which the sunscreen has been applied heavily while combined with other UV protective gear such as long sleeves, pants, hats and shoes. He states that sunscreen, “can effectively block sunlight and cause a lack of vitamin D synthesis in skin,” when 1 oz is applied over the whole body, however he also states that, " most people apply less than this amount." ("Could sunscreen cause Vitamin D deficiency? Short answer: Yes", CNN). This explains that it is incredibly unlikely that an individual would be using enough sunscreen and reapplying it regularly enough in order to impact vitamin D absorption. Dr. Patricia Farris, a dermatologist and fellow of the American Academy of Dermatology also comments on this topic stating, "you can’t recommend exposing patients to a known carcinogen (UV light) just to raise their vitamin D levels.” ("Could sunscreen cause Vitamin D deficiency? Short answer: Yes", CNN). She highlights the importance of protecting patients from UV rays is more beneficial for health even if it could cause vitamin D deficiency as there are other ways to support vitamin D deficiency that don't expose patients to more risks such as dietary supplements.

Could sunscreen cause Vitamin D deficiency? Short answer: Yes | CNN

Answer 7

No, using sunscreen daily shouldn't be harmful to your skin. The claim that daily sunscreen use is harmful to the skin, particularly by impairing the skin barrier and inhibiting vitamin D synthesis, is not supported by current scientific evidence. 

While sunscreens are designed to block ultraviolet B (UVB) radiation—which is necessary for vitamin D production—real-world usage patterns suggest they do not significantly affect vitamin D levels. The British Journal of Dermatology reviewed studies and concluded that "sunscreen use for daily and recreational photoprotection does not compromise vitamin D synthesis, even when applied under optimal conditions."

https://pmc.ncbi.nlm.nih.gov/articles/PMC6899926/? 

Comments

I agree with you that sunscreen shouldn't be harmful to your skin, they are suppose to protect your skin not harm it

Answer 8

There is no scientific evidence that wearing sunscreen every day is bad for your skin, in fact, evidence suggests quite the opposite. According to the American Medical Association, wearing sunscreen daily is one of the best things you can do to protect your skin's health and overall longevity. UVL or ultraviolet light is one of the main causes of skin cancer, and "using sunscreen on a daily basis is critical to protect the skin cells from this damage." You should also be using an SPF 30 or higher, which will filter out about 97% of the sun's UVB rays. 

https://www.ama-assn.org/delivering-care/public-health/what-doctors-wish-patients-knew-about-wearing-sunscreen#:~:text=%E2%80%9CThe%20UVL%20rays%20cause%20damage,will%20penetrate%20through%20the%20clouds.%E2%80%9D

Comments

I I appreciate the statistics you use with your fact check! It gives insightful information that helps educate. I also appreciate the reminder that the claim isn't using a scientific source. It can be easy to forget, but especially with your health involved it's important to find what health professionals say, which you do quite nicely!

Answer 9

Well, there are some ideas that can back up this claim, but, overall, I think it is a misleading and a false statement. On contrary to this claim, it is very harmful to not wear sunscreen. It is recommended by John Hopkins Medicine to wear sunscreen every single day and not only that but to re-apply every two hours. It helps to reduce the risk of aging on skin, sunburns and skin cancer and is overall seen as a very important wear for one’s skin health. It is also important to wear sunscreen that is of good quality which is where this confusion might come into play. Some sunscreens contain an ingredient called benzene; this is typically found in spray sunscreens. This chemical is actually known to cause cancers, specifically leukemia. Some sunscreens can clog pores and cause acne. These examples could be used to back up this idea that sunscreen is “harmful”, but this could just simply mean that one maybe needs to buy a higher quality sunscreen or avoid certain ingredients. Overall sunscreen can help protect one from up to 98% of UV rays, reducing serious lifelong issues that could come from not wearing it.  

Sources used:

https://www.people4ocean.com/blogs/blog/does-sunscreen-cause-acne?srsltid=AfmBOopas6EDWLGuJSFX4tEpDPQOnbQ_G2FYnxMbU1nBD2QoZVLknkYm 

https://www.breastcancer.org/risk/risk-factors/exposure-to-chemicals-in-sunscreen 

https://www.hopkinsmedicine.org/health/wellness-and-prevention/sunscreen-and-your-morning-routine#:~:text=Generally%2C%20sunscreen%20should%20be%20reapplied,often%20you%20step%20outside%2C%20though. 

https://www.uchicagomedicine.org/forefront/health-and-wellness-articles/explaining-the-science-of-sunscreen 

Comments

This is a great fact check. You effectively state why this claim is false, but still acknowledge other reasons as to why sunscreen may potentially 'damage' or 'harm' your skin in other ways. Some of your sources aren't as credible as the others, so you may not have needed to use them, but otherwise good work.

Answer 10

This claim is false, as wearing sunscreen daily is extremely essential for your skin barrier. The American Academy of Dermatology states that wearing sunscreen daily helps prevent harmful sun rays from reaching your skin, thus preventing sunburns or some forms of skin cancer. Furthermore, the Cancer Council states that by using sunscreen, you are less likely to be diagnosed with forms of skin cancer. Both sources highlight the importance along with the benefits of using sunscreen.

https://www.aad.org/public/everyday-care/sun-protection/shade-clothing-sunscreen/is-sunscreen-safe#

https://www.cancer.org.au/cancer-information/causes-and-prevention/sun-safety/about-sunscreen/sunscreen-reactions

Comments

The claim that “using sunscreen daily is harmful to your skin” is misleading in many ways. To clarify, sunscreen can be used to protect your skin from different sources of lights and radiation, but the type of sunscreen in question can make or break this claim. Since there’s a variety of brands with different levels of quality and ingredients, it solely depends on the type. But yes, with the right sunscreen; daily use of sunscreen can be used to protect your skin.
Sunscreen, Preventive Health Behaviors, and Implications ...National Institutes of Health (NIH) (.gov)https://www.ncbi.nlm.nih.gov › books › NBK587264
To break it down further and to be more concise “AAD, the professional organization of dermatologists in the United States, recommends sunscreen use by all persons, including daily use of SPF 30 or higher broad-spectrum products.” Note that it is advised to wear sunscreen daily rather than none at all to decrease exposure effects from UVA, UVB, and blue light radiation. The articles point more to the fact that sunscreen is the most effective sun protective behavior against the sun, than sunscreen itself being harmful. Other beliefs with daily use of sunscreen point to the decease in vitamin D from the sun. According to the NIH, “There is little evidence that sunscreen decreases 25(OH)D concentration when used in real-life settings, suggesting that concerns about vitamin D should not negate skin cancer prevention advice. However, there have been no trials of the high-SPF sunscreens that are now widely recommended.”
Do You Really Need Sunscreen Every Day?The New York Timeshttps://www.nytimes.com › 2024/07/02 › well › sunscre…
Another source “Dr. Sarnoff said, most people get enough UV exposure to make all the vitamin D they need.” Overall there are many beliefs that fear the use of sunscreen when the greater concern should be how to protect ourselves from probable skin cancer.
https://www.healthline.com/health/sunscreen-explained#vitamin-d-deficiency
https://www.nytimes.com/2024/07/02/well/sunscreen-vitamin-d-skin-cancer.html
https://pubmed.ncbi.nlm.nih.gov/35738811/
https://pubmed.ncbi.nlm.nih.gov/30945275/
https://www.ncbi.nlm.nih.gov/books/NBK587264/

---

Wearing sunscreen every day is very important. learning from a dermatologist   has said that it  is important to wear sunscreen every day, even if it's not a sunny day