Knuckle pads.
D003884:Dermoid Cyst / Q000175:diagnosis; D003937:Diagnosis, Differential; D004387:Dupuytren Contracture / Q000150:complications / Q000175:diagnosis; D005384:Finger Joint; D006099:Granuloma / Q000175:diagnosis; D006801:Humans; D006965:Hyperplasia / Q000175:diagnosis; D009784:Occupational Diseases / Q000175:diagnosis; D010489:Periarthritis / Q000175:diagnosis / Q000209:etiology; D013708:Tendon Injuries / Q000150:complications / Q000175:diagnosis