A diseased area of tissue on the tongue of a man suffering from syphilis, being held open by two small metal hooks on chains. Watercolour by C. D'Alton, 1858.

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A diseased area of tissue on the tongue of a man suffering from syphilis, being held open by two small metal hooks on chains. Watercolour by C. D'Alton, 1858. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.