comedo

1. A black-tipped plug clogging a pore of the skin (synset 105253118)
   is a type of: blemish, defect, mar - a mark or flaw that spoils the appearance of something (especially on a person's body)
   is a part of: cutis, skin, tegument - a natural protective body covering and site of the sense of touch
   same as: blackhead

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