Occupation marks.
D002145:Callosities / Q000209:etiology; D003032:Coal Mining; D009783:Dermatitis, Occupational / Q000209:etiology; D005534:Foot Diseases; D005554:Forensic Medicine; D006230:Hand Injuries / Q000209:etiology*; D006801:Humans; D009784:Occupational Diseases / Q000209:etiology*