Prurigo pigmentosa (Nagashima), which is not rare in Japan, is an infl
ammatory disease of unknown aetiology. The characteristic lesions are
pruritic red papules, superseded by reticular hyperpigmentation, chara
cteristically on the back, neck, and chest.(1) We now report a case of
prurigo pigmentosa associated with anorexia nervosa. These findings s
uggest that the ketosis produced by anorexia nervosa may well contribu
te to the pathogenesis of prurigo pigmentosa.