The phenomenon of itchy neck, the more you scratch the more itchy the more red you scratch, first of all, may be due to skin allergies, in addition may also be seen in urticaria, pruritus and other diseases, it is recommended that patients should seek medical treatment if the symptoms continue not to relieve: 1, skin allergies: allergic patients in local skin contact with allergic substances, such as animal hair, some cosmetics, etc., can occur when the specific reaction, causing local or general skin itching The skin of patients with allergies can be allergic to the skin, causing itching, erythema, papules, swelling, etc. Patients can clarify whether they are exposed to suspicious substances, and if it is determined to be caused by allergy, anti-allergy treatment can be carried out under the guidance of a doctor; 2. Urticaria: the clinical manifestations are mainly itching, redness, accompanied or not accompanied by swelling of the skin, with more causes, including some food or drugs, viral or bacterial infections, and physical factors, such as friction, pressure, sunlight exposure, etc., can cause the occurrence of this disease; 3. Pruritus: usually manifests as intense pruritus, usually without primary skin damage. Scratching does not relieve the symptoms, but may instead cause scratches, blood scabs, pigmentation, etc., and may even cause local skin lesions. The etiology of this disease is more complex, and the common ones are dry skin, clothing friction, mental factors, improper diet, etc. In addition, some patients with primary diseases such as diabetes and kidney disease can also develop pruritus.