The most common primary malignant tumor of the hand is:
A. MelanomaSquamous cell carcinoma (SCC) is the most common primary malignant tumor of the hand, accounting for 75 to 90% of all malignancies of the hand. Eleven percent of all cutaneous sec occurs in the hand. It is the most common malignancy of the nail bed. Risk factors include sun exposure, radiation exposure, chronic ulcers, immunosuppression, xeroderma pigmentosa, and actinic keratosis.