[Unilateral "nevoid" spider nevi].

A case of unilateral spider telangiectasia on the left side of the face initiating at puberty is reported. With respect to its therapy and prognosis this alteration must be distinguished from other telangiectasias. With unilateral nevoid telangiectasia it shares the unilateral distribution of the lesions and the predilection for the female sex during hormonal instability periods. Both of these types of acquired telangiectasia seem to occur in relation with endocrine influences. Unilateral nevoid telangiectasia may also show typical spider telangiectasia but occurs in combination with other telangiectatic alterations. Unilateral "nevoid" spider telangiectasia consists exclusively of spider telangiectasia. Pathogenesis and further differential diagnosis of this peculiar type of primary telangiectasia are outlined.