comedo
Concise Oxford English Dictionary © 2008 Oxford University Press:
comedo /ˈkɒmɪdəʊ, kəˈmiːdəʊ/
▶noun (pl. comedones /-ˈdəʊniːz/) technical term for blackhead.
– origin C19: from L., lit. ‘glutton’ (a former name for parasitic worms, later referring to worm-like matter squeezed from a blackhead).
'comedo' also found in these Oxford entries:

