not to be used for advertising or in a defamatory context Surgeon applying a skin graft to a wound on a patient's leg after squamous cell carcinoma (SCC) excision. Squamous cell carcinoma is the second most common form of skin cancer. Most cases arise from pre-cancerous lesions known as solar keratoses, which are caused by sun damage. It mostly affects the elderly. Treatment is with surgical removal of the tumour, combined with radiation therapy and chemotherapy.