"Many people are unaware that skim milk has been linked with acne breakouts," says Bowe. The main culprits: the hormones and milk proteins found in milk, which can clog pores (one study even found that the hormones in milk can boost your oil production up by 60 percent!).
And it doesn't just stop at the gallon of milk you buy at the grocery store. One of the most harmful milk proteins is whey, which is often found in protein supplements like bars and shakes. Cutting out dairy may do a lot for your acne-prone skin, but Bowe recommends incorporating a topical acne treatment with the active ingredient dapsone, like Aczone Gel, to really get acne under control.