Archaic term for syphilis; replaced by 梅毒 (ばいどく) in modern medical and everyday usage.
See also: 梅毒
The disease name '唐瘡' appears in documents from the Edo period.
The term 唐瘡 (とうがさ) literally means 'Tang sore' or 'Chinese sore', reflecting the historical belief that syphilis was introduced to Japan from China. The exact derivation is uncertain.