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See blackhead.
Blackheads are open comedones and whiteheads are closed comedones
a plugged sebaceous follicle containing sebaceous material, which is epithelial cell debris that prevents this material from getting to the external surface of the skin
a plugged sebaceous follicle with sebaceous material, epithelial cell debris like a small logjam that prevents this material from getting to the external surface of the skin and being removed
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