Blemished or acne-prone skin is often associated with oily skin, which in turn is usually caused by an overproduction of sebum. The overproduction can be hormonal or genetic, but it can also be related to the fact that the wrong skin care products are being used. Just because the skin appears oily doesn't mean it has enough moisture. Since acne-prone or oily skin already has a high oil content, skincare should be lightweight and provide the skin with sufficient moisture. A lotion or other type of product with a higher water and slightly lower lipid content is often more suitable for this skintype than a cream.