The redness and heat of the face may be caused by physiological factors such as emotional excitement; it may also be caused by diseases such as rosacea and contact dermatitis. 1. Physiological factors: emotional excitement, strenuous exercise may lead to facial vasodilatation, so that the face appears red, hot and other symptoms, which is a normal physiological phenomenon. 2. Rosacea: Neurovascular dysfunction, impaired skin barrier function and other factors may induce rosacea, causing patients to appear red and hot face, pimples, pustules and other symptoms. 3. Contact dermatitis: The redness and heat of the face may also be caused by contact dermatitis. If the face is in contact with mites, dust, animal hair and other allergens, contact dermatitis may be induced, causing the patient to appear red and hot face, itching, pimples and other symptoms. It is recommended that patients with redness and heat on the face exclude physiological factors, and then go to the hospital in a timely manner, to clarify the cause of the disease, and then choose the appropriate treatment under the guidance of the doctor.