Capillaries are small blood vessels that connect arteries and veins. Broken capillaries on the face are often found on the cheeks and around the nose, and appear as small spidery red, pink or blue marks beneath the surface of the skin.
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A spider nevus is a collection of small, dilated arterioles (blood vessels) clustered very close to the surface of the skin. The cluster of vessels is web-like, with a central spot and radiating vessels.
Spider nevi (plural) can be caused by injuries, sun exposure, hormonal changes, or liver disease, but often the cause is unknown.