acne
"I am an aesthetician, if you use anything topical that makes your skin peel (anything prescription strength) DO NOT WAX. I suggest a 7 day break from any topical prescriptions like that before a face waxing. It doesn't matter if you only use the product on your chin and are wanting to wax your brows, your skin will likely lose a few layers because the retinol/retinoid is still in your bloodstream. 
I used Differin in high school and it worked wonders, I am trying it again at 29 because my breakouts are getting more frequent. Hopefully the purging process (when your underlying breakouts are forced to the surface and everything seems worse) isn't too bad. I recommend using an oil free moisturizer."