— called also black dot, black speck
French, from dartre herpes, tetter (from Middle French dertre, from Latin derbita, of Celtic origin; akin to Middle Breton dervoeden herpes, Welsh darwden, tarwden ringworm) + -ose; akin to Old English teter tetter, Old High German zittaroh herpes, tetter, Sanskrit dadru, a kind of leprosy, skin eruption, Old English teran to tear