Itchy red neck may be insect bite dermatitis, urticaria, eczema and other diseases caused by the patient should consult a doctor in a timely manner to clarify the cause of the corresponding treatment. 1. Insect bite dermatitis: bedbugs, mosquitoes and other bites at the neck of the feet after the skin will appear red, swollen and itchy feet and neck, mostly in the summer, the patient before the onset of more mosquitoes have been to the place, belongs to the bite of local skin allergies and inflammatory reactions. 2. urticaria: with food, drugs, inhalants, infections, physical factors and other reasons related to the common allergic diseases, can occur in all parts of the body, appeared in the neck of the feet can be manifested as localized redness, swelling, pale white masses, accompanied by itching. 3. Eczema: Itchy and swollen feet and neck may also be caused by eczema, is caused by a variety of internal and external factors of the superficial dermis and epidermal inflammation, such as chronic infections, endocrine changes, food and drugs may be triggering factors, there will be a symmetrical distribution of polymorphic rashes, and the neck of the feet can be localized erythema, pimples with itching. There are many other causes of red, swollen and itchy ankles, so it is recommended to consult a doctor for a clear diagnosis.