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, he or she 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
Read more about moles, freckles, and skin tags.