There are two different kinds of birthmarks: vascular
birthmarks and pigmented birthmarks. There are many kinds of vascular birthmarks and
they are related to abnormal proliferations of blood vessels and vascular skin changes.
Pigmented birthmarks are related to clusters of pigmented
cells.
It is not exactly known why birthmarks occur but
there are theories. One of these theories concludes that birth marks occur during fetal
development because certain cells are placed in the wrong layer of
skin.
Birthmarks are more common in females and they are
considered to be non-hereditary.
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