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Introduction. Erythema dyschromicum perstans (EDP) is an acquireddisease, rare in the Caucasian race, with characteristic greyish, ashycolouredskin lesions. The aetiology of the disease is unknown.Objective. To present 5 patients with EDP in relation to cases describedin the literature as: ashy dermatosis, lichen planus pigmentosus, idiopathiceruptive macular pigmentation.Case reports. We present 5 cases with chronic, macular grey pigmentationof the skin of the trunk and the limbs. In 2 cases simultaneousappearance of slightly erythematous reaction and itch of the skin wereobserved. The histopathological picture was similar in all cases. Themain features were: incontinentia of the pigment, slight inflammatory Początkoinfiltrates,and melanophages in the upper dermis. In 2 cases we observeddegeneration of the basal cell layer. The course of the diseases wasmild. Other laboratory tests were normal. In the majority of cases thecause of the disease was toxic.Conclusions. It seems that discrete differences in histopathological pictureand colouring of the lesions are not sufficient to differentiate EDPfrom ashy dermatosis, lichen planus pigmentosus and idiopathic eruptivemacular pigmentation. We believe that all these conditions are formsof the same disease.

Lichen planus pigmentosus (LPP) is a chronic pigmentary disorder with variable pattern of presentation. We here by present two cases of LPP one with parallel band like pigmentation over abdomen sparing the abdominal skin creases and other with parallel band like pattern following the Blaschko’s lines over left side of the abdomen. Our cases are unique not only for its presentation but also for the pattern of distribution and LPP should be the differential diagnosis in any pigmentary disorders.