Horny syphilide.
D000328:Adult; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D013588:Syphilis Serodiagnosis; D013591:Syphilis, Cutaneous / Q000175:diagnosis*; D014382:Tuberculosis, Cutaneous / Q000175:diagnosis; D014860:Warts / Q000175:diagnosis; D015001:Yaws / Q000175:diagnosis