Skin: A capillary malformation is usually present on the face. Most often the lesion is on one side and does not cross the midline, but it can be bilateral. The highest risk region for brain involvement is the forehead area, particularly the area above an imaginary line starting from the top of the ears, crossing the middle of the eyes, and meeting at the bridge of the nose. Risk for eye involvement is highest when the capillary malformation includes the eyelids, particularly the upper lid.
Eye: High pressure in an eye may not show any symptoms, or may present with redness or tearing. Older children may present with decreased vision on the affected side. When the pressure increases very early in life, there can be enlargement of the eyeball itself. The pressure of the eye can be measured by an ophthalmologist and will be higher in the affected eye than in the normal eye.
Brain: Because brain involvement is variable, symptoms differ from person to person. Some patients have no symptoms, whereas others have migraines, seizures, weakness or paralysis on one side. Developmental disabilities ranging from mild to severe can be seen.