Are red birthmarks in infants hemangiomas?

Infantile red birthmarks are hemangiomas. Specifically:

Infantile red birthmarks usually belong to a type of vascular tumor. Birthmarks refer to pigmented spots or locally thickened areas on the skin present at birth, and are categorized into congenital and acquired types. Hemangiomas are benign tumors composed of blood vessels, typically appearing as masses or blood-stained patches in the skin and soft tissues. In the pathological morphology of infantile red birthmarks, characteristics of hemangiomas are observed, such as abnormal proliferation of vascular endothelial cells and vascular smooth muscle cells. Red birthmarks are usually caused by dilation and abnormal distribution of small arteries beneath the epidermis. This condition typically begins to grow during the first or second year after birth, often reaching its maximum size around one year of age, then gradually shrinking and eventually disappearing.

Red birthmarks generally do not severely affect an infant's health, but in certain cases, specific treatment may be required. Most red birthmarks naturally regress over time; however, in some instances, they may cause mirror-image symptoms—such as facial spasms triggered by reflex movements—and early intervention is necessary. Other types of birthmarks, such as lipomas and pilomatrixomas, usually require surgical treatment.