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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.
The exact cause of most birthmarks is unknown, but vascular birthmarks are not hereditary. They are thought to occur as a result of a localized imbalance in factors controlling the development and migration of skin cells.