Almost everyone has suffered from acne at one time or another in his or her lives. It is primarily a disorder of the sebaceous gland (glands in the skin that secrete an oily substance) of the face, the neck and back. When the sebaceous glands become clogged with the oily substance they create, the accumulation results in pimples. There are several forms of acne, but the most common is acne vulgaris, found primarily in adolescents.
The exact cause of acne is not known, but factors that contribute to this condition include heredity, oily skin and androgens. Additional factors include allergies, stress, the use of certain drugs, nutritional deficiencies, liver dysfunction, exposure to industrial pollutants, cosmetics and the monthly menstrual cycle.