Congenital Nevi

Childhood Skin Problems

Medically Reviewed by Stephanie S. Gardner, MD on June 22, 2021
1 min read

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Congenital nevi are moles that are present at birth. These birthmarks have a slightly increased risk of becoming skin cancer depending on their size. Larger congenital nevi have a greater risk of developing skin cancer than do smaller congenital nevi. All congenital nevi should be examined by a health care provider and any change in the birthmark should be reported.

If a dermatologist believes a mole needs to be evaluated further or removed entirely, they will either remove the entire mole, or first take just a small tissue sample of the mole to examine thin sections of the tissue under a microscope (a biopsy). This is a simple procedure. (If the dermatologist thinks the mole might be cancerous, cutting through the mole will not cause the cancer to spread.) Read more about moles, freckles, and skin tags.

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