(anatomy) A pigmented, raised or otherwise abnormal area on the skin. Naevi may be congenital or acquired, and are always benign.

(anatomy) A vascular birthmark or naevus, usually on the head and neck, consisting of an overgrowth of capillaries which produce a reddish to purplish discoloration of the skin.

(medicine) A type of telangiectasis characterised by a central red spot with reddish, outwardly-radiating extensions, resembling a spider web in appearance.