comedo
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
A plug of keratin and sebum lodged within a dilated hair follicle, presenting as either an open blackhead or a closed whitehead.
The presence of comedones distinguishes acne vulgaris from other papulopustular eruptions of the face.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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