What should you know about infant port wine stain?

A port wine stain, also called a capillary malformation, is a flat pink, red or purplish patch caused by widened small blood vessels in the skin. It is usually present from birth and does not rub off. The colour and exact location help a clinician decide whether further evaluation is useful. A mark near an eyelid, forehead or along one side of the face deserves particular attention because nearby structures may need checking.

Arrange a paediatric or dermatology assessment and photograph the mark in natural light so changes in colour or texture are easier to describe. Do not scrub, bleach or cover it with unapproved medicines. If treatment is appropriate, a specialist may discuss [Pulsed Dye Laser Treatment](/treatments/laser-and-energy/pulsed-dye-laser-treatment/), which uses targeted light to treat blood vessels. The timing and suitability depend on the baby’s skin, the mark’s site and the specialist’s examination.

Contact a clinician promptly if the mark becomes raised, bleeds without injury, develops a sore, changes quickly or is associated with swelling around the eye. Seek urgent help if your baby has an eye problem, seizure-like activity, marked weakness or seems acutely unwell. Most colour changes alone are not an emergency, but a new symptom should be discussed.

Ask whether the mark’s location calls for an eye or neurological assessment, how it should be monitored, and whether treatment is advisable now or later. Ask about expected skin reactions, protection from sun exposure and who should perform any procedure.