Itchy red rashes on the face may be caused by eczema, prickly heat, contact dermatitis and other causes. 1. Eczema: the cause of eczema is not clear, and it is considered to be related to heredity, mental factors, infection and other factors. Patients will appear erythema, small papules, papules, blisters, itching and other manifestations. Therefore, patients with eczema on the face will have the symptom of red rash and itching. 2. Prickly heat: prickly heat may be caused by hot and humid environment, sweat duct underdevelopment and other reasons. Patients will have red spots, papules, small blisters, itching, scaling and other symptoms. If the patient has prickly heat on the face, it may manifest as an itchy red rash. 3. Contact dermatitis: contact dermatitis is considered to be caused by contact with primary irritants or sensitizing contacts, etc. Patients will have symptoms such as skin blisters, pimples, papules, redness, swelling, itching and burning pain. If the patient has contact dermatitis on the face, there will be a red rash. It is recommended that patients with red rash on the face itching need to promptly seek medical attention, the doctor will be in a clear cause to choose the appropriate measures for treatment.