Spider naevi consist of a small red central vascular lesion surrounded by multiple tiny blood vessels which branch out from the centre creating a spider like appearance. They generally range from 5-10mm in diameter. Spider naevi mainly develop on the face, and can also occur on the upper half of the body. Although generally asymptomatic spider naevi may be a sign of an underlying medical condition such as cirrhosis of the liver, however they can also appear in healthy people, especially pregnant women, and even as a side effect of medication.
See telangiectasia / broken capillaries for more information.