[A new case of nevus oligemicus].

Unlabelled: Nevus oligemicus is a rare lesion characterized by selective vasoconstriction of the deep dermal vascular plexus compared with the superficial one. It has been suggested that it may be caused by increased sympathetic tone in the deep dermal vascular plexus or an abnormality of hormone receptors, which is why it is considered a functional nevus. Clinically, it presents as an asymptomatic, fixed, livid erythematous macule with a striking decrease in local temperature compared with surrounding healthy skin.