blackheads

/B L AE1 K HH EH0 D Z/
noun
  1. 1

    A comedo, a skin blemish, a type of acne vulgaris, where a pore becomes clogged with a dark, hard, cheesy keratin-filled substance forming a hard black "head" on the skin's surface.

  2. 2

    A form of histomoniasis in poultry, characterized by cyanotic discoloration on the bird's head.

  3. 3

    A scaup: any of various ducks of the genus Aythya.

Source: https://en.wiktionary.org/wiki/blackhead, https://en.wiktionary.org/wiki/blackheads