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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.
Types of birthmarks. There are two main types of birthmarks: Vascular birthmarks are caused by incorrectly formed blood vessels in your childâs skin. Examples include: 1  infantile hemangiomas: the most common vascular birthmark, it usually appears within one to two weeks of birth.ypes of birthmarks. There are two main types of birthmarks: Vascular birthmarks are caused by incorrectly formed blood vessels in your childâs skin. Examples include: 1  infantile hemangiomas: the most common vascular birthmark, it usually appears within one to two weeks of birth.