Types of Acne Whiteheads: Whiteheads occur when a hair follicle becomes clogged with oil and dead skin cells. The pore stays closed, creating a white or flesh-colored bump on the skin. Blackheads: Blackheads occur when a hair follicle becomes clogged with oil and dead skin cells, and the pore stays open. The top of the bump may appear black or dark brown. Papules: Small, red, raised bumps occur when the hair follicle becomes inflamed. Pustules: Pustules are similar to papules, but they contain pus. They appear as small, red bumps with a white or yellow center. Nodules: Nodules are large, painful, inflamed bumps deep in the skin. They can be red or flesh-colored and may not come to a head. Cysts: Cysts are similar to nodules but are larger and filled with pus. They are often painful and can cause scarring.
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