The redness and itchiness of the face when it gets hot is related to facial inflammation and allergies. If there is inflammation on the face itself, heat from the outside will aggravate the inflammation, which will manifest as redness and itching. If the face is exposed to allergens, it will also aggravate the redness and itchiness of the allergy symptoms. It is recommended to stay away from allergens, use fusidic acid ointment or erythromycin ointment externally as prescribed by the doctor, or take anti-allergy drugs orally, such as cetirizine and loratadine. Avoid spicy, stimulating food. The face is red and itchy when it is hot, and there may be other diseases, such as hives, eczema and so on. It is recommended to consult a doctor and follow the doctor’s instructions to use medication.