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What causes a congenital mole?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Most congenital moles are considered a type of birthmark. When congenital moles are very large and appear on the torso, they are sometimes called a bathing-trunk nevi. (Nevi means mole.) Some experts believe that bathing trunk nevi are caused by problems that occur as a baby develops in the womb. Others think that the tendency to have bathing-trunk nevi is passed along in the genes. It's always wise to have a dermatologist evaluate a congenital mole.

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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.