The difference between Birthmark and Naevus
When used as nouns, birthmark means a mark on the skin formed before birth, whereas naevus means a pigmented, raised or otherwise abnormal area on the skin. naevi may be congenital or acquired, and are always benign.
check bellow for the other definitions of Birthmark and Naevus
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Birthmark as a noun:
A mark on the skin formed before birth.
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Naevus as a noun (anatomy):
A pigmented, raised or otherwise abnormal area on the skin. Naevi may be congenital or acquired, and are always benign.