A red itchy rash on the neck could be contact dermatitis, neurodermatitis, tinea corporis, etc. Depending on the specific cause, treatment is prescribed by a doctor. Usually, medication is the main treatment. 1. Contact dermatitis: due to contact with certain easily sensitized or irritating substances and the emergence of metamorphic reaction or irritation reaction, there will be a red itchy rash on the neck, this time you need to promptly avoid re-exposure to these substances, at the same time can be given to the topical hormone drugs, such as mometasone furoate, itching agents such as glycerol detergent, combined with oral antihistamines such as chlortetracycline, and so on. 2. Neurodermatitis: mostly related to local stimulation, mental and psychological factors, can also lead to a red itchy rash on the neck, at this time you need to use topical calcium-modulated phosphatase inhibitors such as pimecrolimus ointment, tacrolimus ointment and other medications, oral antihistamine drugs such as cetirizine. 3. ringworm: due to fungal infection of the skin, there will also be a red itchy rash on the neck, at this time the need for antifungal treatment such as topical miconazole ointment, ketoconazole ointment, etc., and oral itraconazole and other medications when necessary. Do not smoke and drink alcohol in the process of treatment, eat less spicy stimulating food, so as not to affect the therapeutic effect. Normally pay attention to keep the local skin hygiene and clean. If the symptoms are not well relieved by the above treatment, you need to go to the dermatologist as soon as possible for further examination and treatment. The medication should be used according to the doctor’s prescription.