As long as you are using an oil free non com. moisturixer that you know does not clog your pores then there is no such thing as ocerdoing unless you feel like an oilslick. If your skin feels tight after you wash it and is flaking in areas keep moisturizing. If it is peeling and red and hurts you are not using nearly enough. Meds for acne tend to make skin a little flaky and dry and is good to use a moisturizer twice a day unless by the end of the day you feel an oily shine and feel slippery. If you are not flacking but also not getting the oil slick by nightime, you are doing just about fine.