We report on a patient with chronic discoid lupus erythematosus who wa
s treated with argon-laser, The patient suffered from long-standing le
sions and had been pretreated with various drugs, with no or slight im
provement, After a few argon-laser applications, the treated skin lesi
ons improved dramatically while the untreated lesional skin showed con
tinuous disease activity. Histological and immunohistological investig
ations of biopsies from treated and untreated lesional skin suggest th
at endothelial mechanisms play a role in the generation and maintenanc
e of discoid lesions in lupus erythematosus. This is the first reporte
d case of successful treatment of chronic discoid skin lesions of a lu
pus erythematosus patient with argon-laser.