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Why are warts raised bumps on the skin?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Warts are not always raised bumps on the skin. Sometimes warts are smooth, small surfaces on the skin such as flat warts that are found on the face.

Warts are small bumps or skin growths caused by the human papillomavirus (HPV). Warts that are raised may include the common wart that can be found anywhere on the body. Subungual or periungual warts that are around or under fingernails and toenails are raised bumps with a cauliflower-like appearance. Other warts that are raised include genital warts. Warts can clump together on the body to create a cluster of raised or flat surfaces.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.