i was just put on this today i have mild acne on my back, chest and shoulders and face. it is tretinoin 0.01 and eryhtomycin 4 %. now i have no idea what that means but will it help with the acne and fadeing of red marks. also im currently undergoing 2nd round of microdermabrasion on my face so is it ok to use this stuff on my face before and after the treatments?