i havent been on accutane but i got perioral dermatitis from a cleanser i was using. i had to stop using everything on my face so no topicals or moisturizer. you just want to wash your face twice a day and that's it. most times they will put you on an antibiotic as well which will help it go away pretty quickly. lastly i was given topical clindamycin lotion to use twice a day so you need to see your derm to do something about it. i think i had my rash for almost 2 months but the quicker you get treatment the quicker it will go away. also have you tried any new product recently? you could have an allergy to something you have been using on your face. also my derm said that sometimes you can just suddenly develop an allergy to something you have used for a long time as well which is why they dont want you to use anything on your face for a while.