Hii I tend to get one or two pimples just before periods and i dont have qcne prone skin. These pimples leave spots which are really annoying. I wanted to know how to prevent these pimples from coming at the first place??? I wanted to incorporate tretinoin 0.04% gel in my skincare routine as prescribed by my doc to be applied on whole face once a week last yr but i hardly used it for a month. Now i want to start it again. So how do i use 0.04% tretinoin gel to prevent acne just before periods. Frequency? Also can i use niacinamide and vitamin c serums with tretinoin and also aha bha 32% peel. Pls help me out with how to incorporate all these things in my routine for preventing premenstrual flare ups. Pls pls pls help