Acne Eczema Acne Acne eruptions are caused by problems with the skin's normal processes.
Pimples begin in the skin's hair follicles, which are connected to oil-producing glands.
Normally the oil flows out of the hair follicle the the skin's surface, carrying with it dead skin cells from the follicle lining. In acne, the excess oil combines with the dead skin cells, hair fragments, and bacteria to form plugs that block the follicle pore. Once the plug forms, it may be pushed to the skin surface and protrude slightly to form a blackhead. Dirt does not cause blackheads. Their dark color comes from skin pigment mixed into the plug debris.