Because we care about your health and the integrity of your skin, services will not performed if: You are currently using Retin – A, Differin, Accutane. It's important for you to tell your Esthetician if you have taken antibiotics in the six weeks prior to your waxing appointment, or if you have taken any other medications with side effects that include (for example) dry mouth, dehydration. This includes over-the-counter medication that are known blood thinners, such as Aspirin, Ibuprofen, Midol, and Tylenol.