The redness and itchiness of your face when you are hot can be caused by hormone-dependent dermatitis, rosacea, eczema, cholinergic urticaria, etc. 1. Hormone-dependent dermatitis: hormonal dermatitis can be caused by the external use of glucocorticoids for the treatment of certain skin diseases, which is characterized by the original lesions becoming redder. The main manifestations are skin flushing, thinning, capillary dilatation, hyperpigmentation, sweat hair hyperplasia, itching, dryness, burning and other symptoms. Generally discontinue the use of hormones or by medication, the symptoms can be gradually relieved. 2. Rosacea: erythematous capillary dilatation type, in response to different stimuli such as changes in ambient temperature, hot drinks, alcohol, spicy food, exercise or bathing, etc., there can be a persistent flushing reaction, often accompanied by dry skin, itching, burning or tingling sensation. After repeated episodes, skin erythema burning and superficial dendritic capillary dilatation persists. 3. Eczema: Inflammatory skin reaction caused by internal and external stimulation of a variety of factors, may cause skin erythema, rash, itching and other symptoms, the temperature rise may aggravate the symptoms, thus manifesting as a hot face redness and itching. 4. Cholinergic urticaria: mainly due to exercise, heat, stress, eat hot drinks or alcoholic beverages, the body’s internal temperature rises, thus prompting the cholinergic nerve impulses, the release of acetylcholine, the role of mast cells and the onset of cholinergic urticaria, there may be skin tingling, itching, and other symptoms, so it is possible to lead to a hot face redness and itching. The redness and itchiness of the face when hot, there may be other reasons, you need to go to the hospital in time for further examination to clarify the cause.