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cheap fosamax Basal cell carcinoma is the most common type of skin cancer, accounting for 80 percent of skin cancer cases. They're often found on the parts most exposed to the sun and can appear in a raised, reddish, pearly like spot. They also can bleed easily if knocked, are itchy and can become ulcerated and inflamed over time. A skin cancer can also appear as a sore that doesn't heal within four weeks.