Unilateral facial telangiectasia macularis eruptiva perstans

A 36-year-old man developed unilateral facial telangiectases over a 10-year period. Histopathologic examination showed collections of mast cells. This patient has an unusual variant of telangiectasia macularis eruptiva perstans. The differential diagnosis of facial telangiectases is discussed. Mastocytosis should be considered in patients presenting solely with telangiectases.