Tretinoin
"I'm 28 years old and I had pretty good until up until I took hormonal birth control 3 years ago and I am still trying to repair the damage to my skin. I've been using a combination of benzoyl peroxide .25% cream in the morning on cleansed skin and trentinoin .05% cream (not the gel) before bed. My skin is very fair and sensitive but it's finally looking better after 2 weeks. So far I've experienced mild purging by the chin and cheek but they are not the huge cystic pimples I used to get before. I think the peeling and redness is worth clear skin in the end."