1. Type of Progestin
Every birth control uses progestin (a synthetic form of the progesterone hormone). There are many different types of progestin. It is very important that the type of progestin is LOW in androgenic activity, meaning it doesn't send your testosterone into overdrive and create acne.
Here is a list to help choose a birth control.
Neutral (won't affect acne either way) No hormones. Copper Paraguard IUD Good (can reduce acne) Drospirenone. Anti-androgenic. Used in Yaz, Yas