Itchy bumps on the neck are mainly considered to be related to contact dermatitis, heat rash, folliculitis and other diseases. 1. Contact dermatitis: after contact with allergens or irritants, it can lead to pimple-like papules on the affected area, accompanied by itching, redness, swelling, stinging and other symptoms. 2. Heat rash: mainly caused by the blockage of sweat ducts, resulting in sweat can not be discharged smoothly, and after penetrating into the surrounding tissues, it will trigger an inflammatory reaction, which will lead to the formation of prickly heat and cause the patient to have burning and itching sensation. 3. Folliculitis: mainly caused by fungal and bacterial infections in the hair follicle area, which can lead to pimple-like papules and blisters in the affected area, accompanied by itching, redness and swelling. With the above symptoms, it is recommended to consult a doctor in time to find out the cause and carry out standardized treatment under the guidance of a specialist.