There are more reasons for itchy neck, the common reasons are as follows: 1, skin diseases: common is eczema, in addition to itching performance, the patient will grow a lot of bumps on the skin after the onset, usually contact allergies or local irritation caused by the need to isolate the allergen, avoid further contact, may also be long-term exposure to ultraviolet radiation caused by the symptoms of solar dermatitis, seasonal skin sensitivity, such as in the change of season when the neck appears dry The symptoms may be caused by the skin diseases such as urticaria, contact dermatitis, etc.; 2, mosquito bites: after being bitten by mosquitoes, local insect toxicity reactions will occur, and the neck will be red and itchy. The local temperature can be increased and the peripheral nerves can be stimulated to itch. In addition, the air humidity is too low, too dry, etc. may also lead to itching; 5, other factors: such as wearing high-collared sweaters, wearing scarves, scarves and metal jewelry, such as necklaces, etc., causing local skin contact irritation, local allergic reactions, skin redness, itching. In addition, insufficient local hygiene and cleanliness or stimulation due to obesity and excessive sweating can also cause redness and itching of the skin on the neck. Some patients are allergic to certain ingredients in cosmetics, and itching will occur when applied to the neck.