Hormonal imbalances in adolescence cause oily skin. This type of skin is common in teenagers. The oil secretion in skin increases during teen age and decreases as age advances. Hormonal imbalance may appear during pregnancy and menopause, which lead to increase secretion of oil from oil glands of skin. Contraceptive pills and cosmetics also tend to increase the oil secretion. Humidity and Hot weather naturally increase oil secretion from oil glands of skin. The oil producing glands of skin are overactive and produce more oil. The excess oil, which oozes out gives the skin a greasy shine and the enlarged pores make the skin look coarse.