Description: Heavily pigmented bests

History:

 Sudden onset of a new pigmented lesion on the shoulder. Dermatoscopy shows an actively proliferating lesion with peripheral pseudopods that involve most of the circumference. Clinically this was either a Reed nevus or a Spitzoid melanoma. The histology favours a Reed nevus. 

View a recent DOJ article on Reed Nevus Dermatoscopy 

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View Pseudopods in Dermoscopy Made Simple