Basal cell carcinoma is the most common and easiest-to-treat skin cancer. Because basal cell carcinoma spreads slowly, it occurs mostly in adults. Basal cell tumors can take on many forms, including a pearly white or waxy bump, often with visible blood vessels, on the ears, neck, or face.owen Disease. Bowen disease is also called squamous cell carcinoma in situ.. It is a type of skin cancer that spreads outward on the surface of the skin. By contrast, invasive squamous cell carcinomas can grow inward and spread to the interior of the body.