THE CURE
Hello, I have been a long-time lurker for 2-4 years. I have simply cured my perioral dermatitis. This is what worked for me. If this doesn't work for you, I am sorry.
Avene Cicilfate Restorative Cream. Apply every time after washing your face. If you are having a really bad flare-up, DO NOT PUT ANYTHING ELSE ON. For the love of your mother, stop trying 6 products at once. Introduce JUST THIS for a month, and I guarantee you will see a huge difference.
For me, at least, less is more. I don't use face wash. I just wash my face with warm water.
FOR GIRLS
WASH THOSE MAKEUP BRUSHES WITH A CLARIFYING SHAMPOO
-For makeup remover, use Pyunkang Yul deep clear cleansing balm. If you don't want to use that use the water proof makeup remover by Garnier Micellar Water. I don't know why, but the pink one used to cause me severe dermatitis flare-ups.
This is literally all I do, and I haven't had a severe breakout since.
Side note: if you have a breakout, have your dermatologist prescribe antibiotics. That cream shit never works right.