Itchy flat bumps on the body may be due to hives, flat warts, eczema and other diseases. 1. Hives: Hives may be caused by food and drug allergies, infections, autoimmunity, overwork and other factors. Patients will have itchy skin, and itchy parts of the appearance of varying sizes of air masses, manifested in the body of the flat skin bumps and very itchy. 2. flat warts: flat warts are mainly caused by human papillomavirus infection, which can be spread through direct contact with the affected area, or indirect contact with contaminated supplies. The patient will appear in the skin flat pimples, and some patients will have itchy feeling. 3. Eczema: the cause of eczema is not yet clear, may be genetic, hormone level changes, immune abnormalities and other factors. Patients manifested as local itching, pimples, etc., can appear flat skin bumps very itchy situation. There are many causes of itchy bumps, patients should actively cooperate with the doctor to take relevant treatment measures.