Noone knows why birthmarks occur. Contrary to popular belief, they are not inherited.
Basically, there are two differnt types of birth marks.
The first type: Including moles and cafe au lait spots, is caused by malformation of pigment.
The second type: Including strawberry marks and portwine stains, is sometimes known as a haemangioma and is caused by abnormal [...]
A birthmark, or naevus, is an area of discoloured skin present on the face or body which is noticeable either at birth or shortly afterwards.
Birthmarks can take a number of forms. Almost everyone, for instance, has moles. Some babies have stork bites, flt red marks on the eyelids, forehead or neck which fade a few [...]