Acne is a chronic, inflammatory skin condition that causes spots and pimples,especially on the face, shoulders, back, neck, chest, and upper arms.
Whiteheads, blackheads, pimples, cysts, and nodules are all types of acne. It is the most common skin condition in the United States, affecting up to 50 million Americans yearly. It commonly occurs during puberty, when the sebaceous glands activate, but it can occur at any age. It is not dangerous, but it can leave skin scars.
The glands produce oil and are stimulated by male hormones produced by the adrenal glands in both males and females. At least 85 percent of people in the U.S. experience acne between the ages of 12 and 24 years.