An archaic or obsolete term for a pustule or skin eruption, particularly one associated with itch or skin disease.
From Old English and Latin sources, possibly related to 'itch' terminology; appears in medieval medical texts describing various skin conditions.
This medieval medical term shows how doctors used to categorize skin diseases—'achor' referred to pustular eruptions that we'd now diagnose more specifically using modern dermatology, but the word captures how puzzling skin conditions were!
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