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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.
Some common types of birthmarks include: 1  Moles, which are brown or black spots that can appear on the skin at birth. 2  Mongolian spots, which are bluish patches that can appear on the backs of babies and young children, usually those of Asian descent. 3  Port-wine stains, which are flat patches that appear pink or red.