Itchy hard bumps on the body may be papular urticaria, folliculitis, eczema, nodular itchy rash and other diseases. 1. papular urticaria: most patients with the onset of the main insect bites related, manifested as a limited elevation of the skin surface of the red red dermatomal papules, the top of the pinpoint-sized blisters, accompanied by itching, pain and other symptoms, the emergence of itchy hard bumps on the body of the phenomenon. 2. Folliculitis: the disease is caused by bacterial infection of the hair follicle and its surrounding tissues of inflammatory diseases, usually manifested as a single or multiple inflammatory papules, accompanied by mild itching, pain and other symptoms, thus appearing on the body with hard itchy bumps phenomenon. 3. Eczema: Eczema is an inflammatory skin disease caused by a variety of internal and external factors, which may be related to allergies, heredity, infection, immunity and other factors, so that the whole body appears erythema, papules, pimples, accompanied by itching, etc., so that hard bumps on the body is very itchy phenomenon. 4. nodular itchy rash: the cause of the disease is not known, may be related to mosquito bites, may also be related to diabetes and other endocrine diseases, the disease to nodules with intense itching as the main feature, patients often in the arms, legs, back and other parts of the pimples, nodules with intense itching, reddish-brown color, hard, so that there is a hard bumps itchy phenomenon. Itchy bumps may also be caused by other diseases, it is recommended that patients should go to the regular hospital in a timely manner, after a clear diagnosis under the guidance of the doctor for standardized treatment, to avoid delaying the condition of self-medication.