• Question: Why do some people have birth marks and others don't. I have one was is it exactly?

    Asked by issiphee1 to Jo, Leo on 25 Jun 2010 in Categories: .
    • Photo: Leo Garcia

      Leo Garcia answered on 25 Jun 2010:

      Birth marks are blemishes on the skin that are formed while you are still in the womb. The exact cause is unknown, but we know they aren’t inherited, and that they are very common. I have one in my armpit!

      They are a benign (that is, nothing to worry about) growth of blood vessels at the skin surface, and are thought to occur when the growth of those blood vessels goes wrong . However, they aren’t a sign of illness, and aren’t related to cancer.