Acne, also known as acne vulgaris, is a long-term skin disease that occurs when hair follicles are clogged with dead skin cells and oil from the skin. It is characterized by blackheads or whiteheads,pimples, oily skin, and possible scarring.
Symptoms range from uninflamed blackheads to pus-filled pimples or large, red and tender bumps.
These factors can trigger or aggravate acne: hormones. Androgens are hormones that increase in boys and girls during puberty and cause the sebaceous glands to enlarge and make more sebum. Hormonal changes related to pregnancy and the use of oral contraceptives also can affect sebum production.