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Different Types of Acne

Blackheads -- are caused by partially blocked pores. The "black" appearance of them is not caused by dirt, but by the melanin pigment from the dead skin cells.

Whiteheads -- are caused by completely blocked pores. The white appearance of them is caused by the bacteria inside the blocked pore turning the sebum to "free fatty acid".

Papules -- are small, red, tender bumps or spots.

Pustules -- are larger, red and inflamed pus-filled spots.

Nodules -- are large hard bumps under the skin's surface.

Cysts -- are similar to nodules, but can be deeply inflamed and infected.

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