Do a lot of people get hemangiomas?

Not common. Hemangiomas are benign overgrowths of blood vessels. The most obvious are on the skin and occur in infancy. But some also occur internally, most not causing a problem, but some associated with inherited vascular overgrowths and internal bleeding with changes in bodily function. See your family doctor or pediatrician if you suspect a problem in this area.
5-10% of 1yo's. Hemangiomas are one of the most common benign soft tissue tumors of infants, often over looked in newborns, they increase in size & density until ~1yo before going into a stable phaze, then softening & regressing. By 4-5y most have shrunk to a fraction of their peak size & leave a parchmant like skin surface over their exterior.