Rash on the back of the neck may be related to hives, eczema, folliculitis and other diseases. 1. Urticaria: If the back of the neck comes into contact with allergens in the environment such as dust, pollen, animal fur, etc., allergic dermatitis may be induced, which may lead to the appearance of a rash on the back of the neck. 2. Eczema: In addition to the symptoms of eczema, patients with eczema will also experience dry, itchy skin and other symptoms. 3. Folliculitis: If the patient wears rough clothing for a long time, then it is easy to make the back of the neck by friction and stimulation, which causes bacterial infection, resulting in the hair follicles at the back of the neck is clogged and triggered by folliculitis, the back of the neck symptoms of a rash. There are other reasons for the rash on the back of the neck, it is recommended that patients go to the hospital in time to find out the cause of the disease, to standardize the treatment, so as not to delay the condition.