Quite simply: you're using too many products. "A complicated skin regimen, with a lot of active ingredients and preservatives, can end up throwing oil into the fire," says Dr. Paul Jarrod Frank, a cosmetic dermatologist based in New York. "People who have average to good skin: start out with a basic cleanser and a moisturizer." If your skin changes depending on the season, stock whatever you need to mitigate problems (for instance, if your skin is dry in the winter and oily in the summer, you might want a cream moisturizer for the colder months and a gel moisturizer in the summer). As for your other products? "Open up the garbage and siphon out what you don't need," advises Frank.