Itchy bumps on the back of the neck may be caused by eczema, neurodermatitis, folliculitis. 1. Eczema: allergies, endocrine disorders, external climate change and animal fur stimulation may trigger eczema, so that the back of the neck appear red spots, pimples and other polymorphic lesions, accompanied by obvious itching symptoms. 2. Neurodermatitis: mental factors, gastrointestinal dysfunction, local mechanical and physical stimuli, may make the local skin appeared in dense pieces of polygonal flat papules, accompanied by itching symptoms. 3. Folliculitis: associated with bacterial infection, commonly associated with Staphylococcus aureus infection, can lead to the appearance of red papules on the back of the neck centered on hair follicles, accompanied by itching or pain. Patients who have symptoms of itchy bumps on the back of the neck are advised to go to the hospital in time for targeted treatment under the guidance of the doctor.