Based upon your description, I too am concerned that this may be a squamous cell carcinoma of the skin or, given that a "mole" was initially present, melanoma is a possibility; although most melanomas, if left untreated for 12 years, would likely have spread extensively by now (basal cell carcinoma is also a possibility). He should see either a dermatologist or an ENT surgeon, and have this lesion biopsied without further delay.
Sincerely,
Robert A. Wascher, MD, FACS