Numbness of the face after a hot bath is considered to be related to allergies and insufficient blood supply. 1. Allergy: After taking a hot bath, facial numbness, may be related to allergies, the bath used cleaning products, if the facial skin caused by stimulation, may lead to numbness after the bath face. 2. Insufficient blood supply: After taking a hot bath, the blood circulation of the whole body is accelerated, the skin capillaries are expanded, and the blood supply to the brain is relatively reduced, so the symptoms of numbness of the face may occur, and may be accompanied by dizziness and other discomforts. Face numbness after bathing, with a variety of factors, if the symptoms can not be relieved, it is recommended to go to the hospital in a timely manner to understand the reasons for the cause of the drug treatment.