Abstract： A cage of rheumatoid neutrophilic dermatitis is reported.A 62-year-old woman presented with multiple erythematous papules on the trunk and extremities for 10 years.Two years prior to the Ⅱ diabetes mellitus,interstitial pneumonia and chronic renal insufficiency.The patient clinically presented with generalized millet-to mung bean-sized edematous erythema,papules,maculopapules over the faciocervical area,extremities and trunk.Infiltrated nodules were locally scattered,especially on the back.There were diffused,large dark-erythematous patches on the extensor surface of both limbs,knees,thigh and buttock,as well as pigeon egg-sized,dark erythematous or pitchy,painful nodules on both elbows,knees,hands,feet and aural region.Rheumatoid factor was positive.Histological examination demonstrated a dense and diffuse infiltration of lymphocytes and neutrophils in upper dermis;nuclear dust and extravasation of erythrocytes were noted,but vasculitis was absent.The diagnosis of rheumatoid neutrophilic dermatitis was established based on medical history,clinical features,laboratory findings and histopathological manifestation.