The condition of oily skin occurs when there is an accumulation of excess oil on the skin, especially the face. This happens when the hyperactive sebaceous glands lead to an overproduction of the oil. Although a particular amount of oil is necessary to maintain skin moisture, too much of oil production could lead to a perpetual state of greasiness and lead to uneasiness and also give rise to pimples, acne and blackheads due to clogging of pores.