Sam Becker's pursuit of the "black spot".
D003880:Dermatology / Q000266:history; D003937:Diagnosis, Differential; D049673:History, 20th Century; D006801:Humans; D008545:Melanoma / Q000266:history* / Q000473:pathology; D009508:Nevus, Pigmented / Q000266:history / Q000473:pathology; D012878:Skin Neoplasms / Q000266:history* / Q000473:pathology; D014481:United States