Itchy bumps on the back of the neck may be caused by the following: 1, allergy to the clothes worn, resulting in itchy, red, rice-grain-sized bumps on the back of the neck, oral levocetirizine hydrochloride tablets, rubbing urea ointment or Denide cream on the affected area, replacing cotton clothes. 2, clothes that are not cotton and have too high a collar, rubbing the skin on the back of the neck for a long time, causing damage to the skin surface and bacterial infection, resulting in Pay attention to sun protection and reduce ultraviolet stimulation to help the recovery of the disease.