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A member asked:
Why do some people have birth marks?
3 doctors weighed in across 2 answers
No one really knows: Nobody really knows what causes birthmarks. Vascular birthmarks are not hereditary but thought to be caused by overdevelopment or overgrowth of blood vessels. Many theories for different types of birthmarks: some may be hereditary (most are not), some caused by random genetic mutations, overgrowth of pigmented cells called melanocytes, abnormal collection or overgrowth of blood vessels.
Answered 12/4/2014
6.3k views
Random luck: In most cases. Occasionally, there are birthmarks that are associated with genetic syndromes, but these are less common.
Answered 8/13/2013
4.9k views
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