I was reading this site which broached comedones, an esoteric word to me; so I thought to look up its etymology which I find exceptionally singular and peculiar (I would have never guessed that the word originated from
to eat up !) :
Etmyonline: "blackhead," etc., 1866, from Latin comedo "glutton," from comedere
"to eat up"(see comestible). A name formerly given to worms that devour the body; transferred in medical use to secretions that resemble them.
Footnote: ODO also offers an etymology.