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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.
Slide show: Birthmarks. Contrary to their name, birthmarks aren't always present at birth. Some, such as hemangiomas, develop weeks later. Most birthmarks are permanent, but a few types fade as a child grows. Birthmarks are common and usually harmless. But some may require treatment for cosmetic reasons or because of rapid growth.