What are birthmarks? Red birthmarks and pigmented birthmarks are the two main kinds of birthmarks. A vascular (blood vessel) birthmark is one that is red. Birthmarks that are pigmented are those where the color of the birthmark is different from the color of the surrounding skin. What are red birthmarks? Birthmarks that are colored and vascular (blood vessel) in nature … [Read more...] about Birthmarks: Types, Causes, Complications and Treatment