Spider nevus

A benign cutaneous vascular lesion consisting of a central dilated arteriole with radiating telangiectatic capillaries in an arachniform pattern, typically located in superior vena cava distributions and associated with hyperestrogenic states. Possible causes are hormonal change (pregnancy, puberty, oral contraceptives, hormone replacement therapy), liver failure, skin trauma, sun exposure, thyroid disorders, and autoimmune conditions (rheumatoid arthritis).