Hemangioma (strawberry birthmark) – This is the most common birthmark, occurring in 3-5 percent of babies. Like its counterpart angioma seen in adults, it’s a bright red spot. It will often grow rapidly in the first few months of life. It can be problematic if it blocks airways or vision. Typically no treatment is necessary. Most will begin to shrink and fade after the first year. It can take 5 to 10 years to completely go away.