Meaning

noun a black-tipped plug clogging a pore of the skin

originFrom Latin comedō (“glutton”). Applied to blackheads on account of the popular belief that they were parasitic worms that consumed the host’s nutrients, especially in children, thereby causing weight loss and illness. Compare Danish hudorm (“comedo”, literally “skin-worm”). More information In Johann Heinrich Zedler's universal lexicon, comedo is one of four Latin translations for the entry…

Etymology from Wiktionary, CC BY-SA 3.0