What are birthmarks and why do we get them?

What are birthmarks and why do we get them?

"Birthmark is the term used to describe any of the large number of common skin marks that are present at birth or appear soon afterwards. It doesn’t mean they were caused by the physical process of birth. Birthmarks generally result from an overgrowth of a structure that is normally present in the skin. For example, an overgrowth of blood vessels produces vascular birthmarks or haemangiomas; an overgrowth of pigment cells produces congenital naevi or moles."

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