A pimple forms when the damaged follicle weakens and bursts open, releasing sebum, bacteria, and skin and white blood cells into the surrounding tissues. Scarring occurs when new skin cells are laid down to replace damaged cells. The most common sites of acne are the face, chest, shoulders, and back since these are the parts of the body where the most sebaceous follicles are found. The exact cause of acne is unknown. Due to the hormonal changes they experience, teenagers are more likely to develop acne.
Boys have more severe acne and develop it more often than girls.
Hormonal disorders can complicate acne in girls. Individuals with a family history of acne have greater susceptibility to the disease. Acne can flare up before menstruation, during pregnancy, and menopause. No foods cause acne, but certain foods may cause flare-ups. Acne can be a side effect of drugs including tranquilizers, antidepressants, antibiotics, oral contraceptives, and anabolic steroids.