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Types of Birthmark most Likely to Appear after Birth. Red-colored birthmarks are the most likely to appear after birth. Black, brown, and other dark-pigmented marks that are not related to broken blood vessels are typically present during gestation. Birthmarks are distinct from cancer growths.
Marks as a result of excessive accumulations of melanin are called pigmented birthmarks, since the great majority of them are brown to black. Other birthmarks appear lighter than the rest of the skin due to a relative lack of melanin. Some birthmarks are composed of blood vessels and are called vascular birthmarks.They are generally red, blue, or purple. Other birthmarks are composed of lymphatic tissue (cystic hygroma), breast tissue, and epidermal tissue, which are often yellow to flesh-colored.arks as a result of excessive accumulations of melanin are called pigmented birthmarks, since the great majority of them are brown to black. Other birthmarks appear lighter than the rest of the skin due to a relative lack of melanin. Some birthmarks are composed of blood vessels and are called vascular birthmarks.