The red itchy bumps on the face when it is hot may be due to atopic dermatitis, which is usually treated with medication, including topical medication and systemic medication. 1. Topical medication: Topical glucocorticosteroids are the first line of medication. Glucocorticosteroids include dexamethasone, budesonide, methylprednisolone and so on for treatment. In addition, calcineurin inhibitors such as tacrolimus ointment and pimecrolimus ointment are also effective. When topical medication is used, attention needs to be paid to the intensity, dosage, and course of treatment to be adequate. 2. Systemic medications: If the itching is severe and interferes with sleep, antihistamines such as cetirizine can be used. There are secondary bacterial infections that are treated with antibiotics such as penicillin. If the face is red and itchy with goose bumps when it is hot, you should consult a doctor to use drugs under the guidance of the doctor, do not use drugs on your own to avoid causing serious complications.