Malignant blue (Ota's?) nevus.
D001706:Biopsy; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008545:Melanoma / Q000175:diagnosis; D009508:Nevus, Pigmented / Q000175:diagnosis* / Q000473:pathology; D012878:Skin Neoplasms / Q000175:diagnosis*