Dry itchy red face can be considered to be a variety of factors caused by inflammatory skin diseases, mainly showing skin redness, swelling, dryness, itching, etc.; the cause of its causes vary according to the type of dermatitis; common types of dermatitis, including contact dermatitis, atopic dermatitis, seborrheic dermatitis, neurodermatitis, and insect bites dermatitis. 1. Contact dermatitis: this type of dermatitis is caused by skin or mucous membrane contact with exogenous substances that irritate the skin or cause allergic reactions; according to the nature of the exogenous substances, they are mainly divided into animal (animal dander, etc.), plant (pollen, dust, etc.), and chemical (cosmetics, etc.) three categories. 2. Atopic dermatitis: the pathogenesis of this kind of disease may be related to a variety of factors, including skin barrier abnormality, intrinsic immune response defects, Th2 dominant adaptive immune response and skin resident microbial flora alteration, etc., and there is also a certain genetic basis. 3. Seborrheic dermatitis: the pathogenesis of this type of dermatitis is unclear, and may be associated with elevated androgens, sebaceous glands and Malassezia infection. 4. Neurodermatitis: This type of dermatitis refers to skin changes secondary to excessive scratching of the skin, and there is usually an underlying cause for the itching or scratching, such as atopic dermatitis, arthropod bites, or psychological disorders. 5. Insect bite dermatitis: most cases occur in association with insect bites, an allergic reaction that occurs after the bite. Common such as fleas, lice, mites, mosquitoes and bedbugs. Dry itchy red face has more causes, it is recommended that patients seek timely medical attention to clarify the cause of the disease, standardized treatment under the guidance of the doctor, so as not to delay the condition.