Itchy face may be caused by allergies, such as contact dermatitis, hives, etc.; it may also be caused by mites, such as insect bite dermatitis, etc.; it may also be caused by no clear reason, such as seborrheic dermatitis. 1. Contact dermatitis: this disease is caused by skin contact with exogenous disease-causing substances, such as soap, bleach, animal fur, dust, etc., which irritate the skin or trigger an allergic reaction, manifesting as erythema, swelling, pimples, blisters, or even blisters, accompanied by itching and other symptoms. 2. Urticaria: This disease is mainly caused by hot and cold stimulation, contact with pollen or dust and other allergic substances, manifested as wind puffs and/or angioedema, mostly accompanied by itching, erythema, uneven skin surface and other symptoms. 3. Insect bite dermatitis: this disease is mainly caused by mites, mosquitoes, fleas and other insect bites, usually after being bitten by mites, it will be manifested as edematous fusiform wheals, papules or petechiae, on which there are small blisters, and occasionally large blisters, accompanied by itchiness, scratches, scabs and so on. 4. Seborrheic dermatitis: the etiology of this disease is not yet clear, may be related to genetics, fungal infections, skin lipids, skin barrier function is impaired due to a number of factors, the performance of red patches, covered with greasy scales, can be accompanied by itching and other symptoms. Itchy face can not only be caused by allergy or mite infection, but also may be caused by no clear trigger, it is recommended that the patient according to their own situation, if necessary, go to the regular hospital dermatology department, follow the doctor’s instructions to clarify the cause of the disease, and active treatment.