It all boils down to your genetics and how your body reacts to the type of birth control that it is adjusting to, this could be the pill, patch, mud, or injection, among several other options. Typically it would be linked to hormonal acne "some of the most common are Norgestrel, Norethindrone acetate, and Levonorgestrel. It’s also common for women who start taking birth control to have an initial acne flare as their bodies adjust to the hormones. After two to three months, most women find their bodies adjust to the hormones and their skin settles down." (Nurx). So it is not always permanent. Yet there have also been studies that prove some people have the opposite reaction with birth control when it comes to acne "Combination birth control pills and other birth control methods containing both progestin and estrogen have proven very effective in controlling both non-inflammatory and inflammatory acne. The mix of hormones help reduce androgens in the body. This, in turn, reduces sebum production, so pores are less likely to get clogged and acne is less severe, or eliminated entirely."