Dry, flaky and itchy skin behind the ear may be due to eczema, contact dermatitis, fungal infections and other factors. 1. Eczema: abnormal immune function, skin barrier dysfunction and other factors may lead to the occurrence of eczema behind the ear skin, manifested as erythema, peeling, dryness, cracking, itching, oozing, crusting and other symptoms, often symmetrically distributed on both sides. 2. Contact dermatitis: when the skin behind the ear is in contact with certain hair dyes, skin care products, chemical products, may lead to contact dermatitis, manifested as erythema, blisters, oozing, scabs, flaking and other symptoms, the patient is often self-conscious itching, burning. 3. Fungal infection: fungal infection of the skin behind the ear can lead to the appearance of erythema, papules, blisters, dryness, peeling and other symptoms, mostly accompanied by intense itching. Dry and itchy skin behind the ear may also be due to other factors, it is recommended that patients seek medical attention in a timely manner, and actively cooperate with the relevant examination to clarify the cause of the symptomatic treatment.