Ulcerated mucous patches on the tongue

Watercolour drawing of the tongue of a man, 28 years old, showing ulcerated mucous patches due to secondary syphilis. They had been rubbed by the teeth, were ulcerated, fissured, and inflamed. The yellowish trefoil patch towards the dorsum shows how the disease spread during the course of a week, when he was under observation. Out-patient Department, November 1882.