Itchy skin with a small bumps when the skin is hot is mostly seen in corn rashes, eczema, cholinergic urticaria and so on.
1. Corns: mainly due to the hot and humid environment or summer caused by the blockage of the sweat ducts, will lead to small blisters on the skin pimples, some patients will feel itchy or tingling, in the heat of the weather is more pronounced, the weather will subside when the cooler.
2. Eczema: the specific cause is not clear, but consider and environmental factors, immune factors, genetic factors, etc., may also be due to sun exposure, scratching, friction, physical mechanical stimulation, etc., in the acute phase, often manifested in the skin with millet size pimples, erythema, etc., and accompanied by intense itching.
3. Cholinergic urticaria: may be due to alcohol, stress, exercise, eating hot food or hot drinks, resulting in the skin local center of the body temperature, because of the cholinergic nerve impulses, will release a large number of acetylcholine, the role of mast cells, which leads to pimples.
Skin itchy when hot a piece of small bumps, there may be other causes, should be timely to the hospital, with the doctor to take treatment.