found at the opening of a sebaceous follicle (pore). Blackhead comedones occur whendead skin cells and sebum block the pore through which a hair emerges from the skin, and the oil thatwould normally travel to the surface of the skin gets stuck and solidifies. The “black” appearance of themis caused by the oxidizing effect of air on the sebum in a blocked pore and the melanin pigment from the dead skin cell
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