The types of birthmarks can be classified as either a vascular birthmark, which are made of blood vessels causing the birthmark to appear red, or a pigmented birthmark, which consists of a cluster of melanocyte cells causing the mark to be a color that is different from your natural skin color, often ranging from brown to black. Specific types of vascular birthmarks include: - Port-wine stain birthmarks - Strawberry hemangiomas - Cavernous hemangiomas - Salmon patches/stork bites Specific types of pigmented birthmarks include: - Café au lait spots - Dermal melanocytosis - Pigmented nevi (moles) - Congenital nevi - Nevus sebaceous Each of these types of birthmarks can range quite a bit in color, shape, and size but are classified as birthmarks if they are present at birth, are a different color from the surrounding skin, can be raised or flush on the skin, and can be as small as a pinhead or as large as a closed fist.