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Causes of birthmarks
Experts do not fully understand why some babies have birthmarks while others do not. Most experts agree that vascular birthmarks are not inherited.
An over-accumulation of cells that make up the lining of the baby's blood vessels are believed to cause the development of strawberry marks.
In some cases, experts believe that a tiny piece of placenta may have got lodged inside the developing embryo very early during pregnancy.
If the nerves that control the dilation (widening) or constriction (narrowing) of capillaries are damaged, there is a risk of port wine stains, especially if the capillaries are permanently widened in one area.
Salmon patches are caused by an accumulation of capillaries under the skin.
Some experts believe that some proteins produced by the placenta during pregnancy may be linked to a higher risk of developing some types of birthmarks.
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