There are four main types of facial skin, distinguished by the secretion of sebum: normal, dry, oily and combination.
Normal skin has a balanced level of sebum production, and is not prone to excessive oily sheen or dryness.
Dry skin experiences a lack of sebum and can be rough and prone to irritation.
Oily skin is characterized by excessive sebum production and prone to acne and shine.
Combination skin has areas of both dryness and oiliness, usually in T - zones (forehead, nose and chin).