Tretinoin
"I started tretinoin .05% 6 weeks ago every other night. I applied right after washing my face. Big mistake. Very red with lots of peeling. My second mistake was to rub the skin off when it was softened in the shower. While skin felt smooth instantly, there was painful stinging the minute I tried to moisturize. I had to wash off. Since then I've started waiting 30min before applying and I definitely don't rub it off in the shower. I'm still just at twice a week and having dry flaky skin within two days of applying-makeup looks awful. So I went to a derm who is also the owner of a med spa. She explained diff between hydration vs  moisturizers and put me on hydration serums. So much better!"