Red herpes around the neck and scalp, the possible diseases are allergy, eczema, shingles and so on. 1. Allergy, may be in contact with something that causes allergy, such as dust, animal hair, etc., caused by the allergic symptoms, increased vascular permeability, the appearance of red rash. 2. Eczema, a chronic inflammatory disease in which an allergic reaction causes an increase in vascular permeability, resulting in a rash, most of which is accompanied by itching and is mostly symmetrical. 3. Herpes zoster, a viral infection, viral invasion of the skin, causing skin damage, blister-like rash, mostly on one side, not across the midline, pain symptoms are more obvious. In short, around the neck and scalp long red herpes, need to pay attention to, combined with pain, itching or disease progression, need to go to the hospital dermatology department in time.