Redness and itchiness from neck to face may be related to allergies, such as eczema, solar dermatitis, urticaria, and so on. 1. Eczema: the etiology of eczema is not yet clear, it is an acute inflammatory reaction of itching, redness and swelling of the skin caused by a variety of factors. Eczema starts rapidly and develops quickly, often manifested as redness, swelling, pimples and itching on the head, face and limbs. Topical glucocorticoids such as hydrocortisone cream can be used, and if the condition is serious, Hasinide can be used. 2. Solar dermatitis: prolonged exposure to high-intensity ultraviolet radiation is a common cause of solar dermatitis. Patients in the high intensity of sun exposure within a few hours of sun exposure can appear red sunburn spots. Symptoms such as edema and itching often appear on the neck and face. For the sunburned parts of the available glycerite lotion or compound menthol ointment, severe cases can be used 3% boric acid water wet compress. 3. Urticaria: Urticaria is a kind of allergic skin disease, which can be manifested as erythema and doughnut with itching. Can be used externally with glycerine lotion to stop itching, oral loratadine, cetirizine and other antihistamines. It is recommended that patients with red and itchy neck to face go to the hospital in time, after a clear diagnosis of symptomatic treatment, do not blindly deal with their own. All of the above drugs should be used in accordance with medical advice.