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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.
Many people are born with birthmarks. For others, they appear within the first few weeks of life. Birthmarks can be brown, tan, blue, pink or red. Vascular birthmarks are made up of blood vessels bunched together in the skin. They can be flat or raised, pink, red or bluish discolorations. Pigmented birthmarks are flat, light brown patches on the skin that can occur anywhere on the body. The exact cause of birthmarks is unknown.