Oily face is a result of hyperactive sebaceous gland, yung gland underneath our skin na nagpiproduce ng oil. Hyperactive sebaceous gland is a result of any spike in hormones (testosterone, estrogen, prolactin, peogesterone, IGF-1, growth hormone, etc.) Nangyayari yan during menstruation or you have eaten food na nagpapataas ng one of those hormones like dairy, which contains cow's milk (may growth hormone at IGF-1), pwede din thru injections ng anabolic steroids.
You can use products na may active ingredients na retinoid, niacinamide, ceramides, azelaic acid, salicylic acid (BHA), hyaluronic acid, benzoyl peroxide. Huwag ilayer sa balat, just use one of them once per day.