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Mark on thigh, gets darker. Related to veins or birthmark?

My 4 month old son has had this mark on his left thigh since he was born. At first the doctor thought it was a birthmark or something to do with his veins. But because it didn t change she said it s a birthmark. But just this last week it started to move up towards his hip and down behind his knee . When he s active it gets bigger and darker. But when he s not active it disappears totally. So now she says she s never seen a mark like it but she still thinks it s a birthmark. Could it be a birthmark or does it have something to do with his veins?
Asked On : Tue, 12 Feb 2013
Answers:  1 Views:  36
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Dermatologist 's  Response
hi..thanks for your query.
Nevus is the medical term for the birth can present at birth or appear shortly after birth, usually in the first month. They can occur anywhere on the skin.Birthmarks are caused by overgrowth of blood vessels, melanocytes, smooth muscle, fat, fibroblasts, or keratinocytes i.e various structural components of the skin or its connective tissue.So they can either be:
1)Pigmented birthmarks caused by excess skin pigment cells include moles, café-au-lait spots, and Mongolian spots.
2) Vascular birthmarks are caused by blood vessels and include macular stains (salmon patches), hemangiomas, and Port-wine stains.
The vascular birth marks can change in appearance according to the amount of blood flowing into it, which might depend on activity of the child.
However, determination of the actual type of birth mark can only be done by inspecting it, so i would advise you to visit a dermatologist for the same .It will also help you to know the further course of precautions/actions required,if any.
hope this helps..take care!
Answered: Tue, 12 Feb 2013
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