Lichen striatus or blaschkitis of adulthood - Variations on a theme?

A 64-year-old woman presented with extensive erythematous papulosquamous le sions along the lines of Blaschko on the right half of the trunk and the ri ght leg. The clinical and histological features led to the diagnosis of lic hen striatus, a dermatosis which usually appears during childhood. Treatmen t with acitretin led to marked improvement. Lichen striatus and its differe ntial diagnoses particulary "blaschkitis of adulthood" as first described i n 1990 - are discussed.