Hot water bath skin itching may be dry skin, cholinergic urticaria and other causes. 1. Dry skin: the skin is dry due to less oil secretion or dehydration of the skin, and its stratum corneum has a reduced ability to resist the outside world, and is prone to discomfort such as itching and stinging when stimulated by hot water. 2. Cholinergic urticaria: It is a special type of urticaria, which is caused by the rise of body temperature, prompting the cholinergic nerve impulse and release of acetylcholine, which acts on mast cells. Its main manifestation is the discomfort of windy skin, accompanied by itching or stinging. This can cause hot water bath skin itch. There are many other causes of itchy skin in hot water baths, which should be emphasized, and timely consultation should be made to identify the cause of the disease, and further treatment or therapy in accordance with medical advice.