Most basal cell carcinomas can be mistaken for warts, skin growths caused by various viruses that enter the body through broken skin. Like warts, some cancerous skin growths can be painless but irritating, but one shouldn't ignore a lump unless they are sure it is a wart. A doctor can usually confirm whether or not a skin bump is a wart with a visual inspection. If he is unsure, he may take a biopsy and send the sample for testing.

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