A 27 year old man, who works outdoors, notices a growth on the skin which includes a darkly pigmented spot surrounded by a halo of inflamed skin. This man has a very fair complexion, with numerous freckles and blond hair. Because of his job and recreational interests he spends a great deal of time outdoors and often gets sunburned in the summer time.
The pigmented spot was removed surgically and sent for biopsy. It was determined to be malignant, but there was no evidence of metastasis.
1. What is the most likely diagnosis of the condition described. Explain.