An irregularity in the skin that is present at birth. It can be located on any part of the body. Birthmarks are caused by overgrowth of blood vessels, melanocytes, smooth muscle, fat, fibroblasts, or keratinocytes. Found on https://judithaugustcosmetics.com/glossary/
1) Moles 
An irregularity in the skin that is present at birth. It can be located on any part of the body. Birthmarks are caused by overgrowth of blood vessels, melanocytes, smooth muscle, fat, fibroblasts, or keratinocytes.