Acne is a disease of the hair follicles of the face, chest, and back that affects almost all teenagers during puberty, the only exception being members of a few primitive Neolithic tribes living in isolation. It is not caused by bacteria, although bacteria play a role in its development. It is not unusual for some women to develop acne in their mid- to late-20s. Acne vulgaris is typical teenage acne which is characterized by three types of lesions:
-the comedo or blackhead
-the inflammatory papule
-the pustule or pimple.
Acne appears on the skin as
-occluded pores, also known as blackheads or whiteheads
-tender red bumps also known as pimples or zits
-pustules (bumps containing pus), and occasionally as
-cysts (the deep pimples and boils of cystic acne).
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