Tags: Disease.
A birthmark is a benign irregularity on the skin which is present at birth or appears 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.Dermatologists divide birthmarks into two types. Pigmented birthmarks caused by excess skin pigment cells include moles café-au-lait spots and Mongolian spots.