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  • Diseased tissue on the tongue of a man suffering from syphilis, with a detail below showing an area of psoriasis on the man's arm. Watercolour by C. D'Alton, 1865.
  • Diseased tissue on the tongue of a man suffering from syphilis, with a detail below showing an area of psoriasis on the man's arm. Watercolour by C. D'Alton, 1865.