If this substance is released deep into the skin it will cause a cyst, which is a small, pus-filled bump beneath the skin. When these bacteria are trapped within the hair follicles, they can cause infections and inflame the follicles. Virtually every adolescent experiences some comedones. Generally, acne starts at about age 10 to 13, and lasts for 5 to 10 years. Acne occurs in both male and female adolescents, but males are more likely to have a severe form of acne.
Some people develop acne for the first time as an adult.
Certain forms of acne tend to run in families. If an adolescent's parents or older siblings have severe acne, the adolescent has a higher risk of developing severe acne. This type of manipulation actually makes the acne worse. Acne is diagnosed when blackheads, whiteheads, pimples, pustules, or cysts are seen on the skin. Long-term acne can lead to permanent scarring.