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What causes scratching of the skin immediately after bathing and during hot temperatures? Which are the suitable drugs to use?

Dear Reader,

You may have cholinergic urticaria, which means that you itch when you feel hot, anxious, when you sweat from exercise, when you eat something hot or spicy, when you take a hot shower or when you get angry. This causes an itchy red rash with wheals around the pimples, starting within six minutes and lasting between 30 minutes to two hours. It may also lead to headache, dizziness, hypersalivation, abdominal cramps, palpitations or shortness of breath. Rarely, the symptoms can be severe and life threatening. It has no known cause, but is thought to occur either because of a dysfunction in the nerve fibres in the sweat glands or due to an allergy to sweat. It is more common in people who have other allergic conditions

You may also have aquagenic pruritus, which just means itching caused by water, a kind of allergy to water. Contact with water produces an intense itching of the skin, usually with a prickling sensation, without any observable rash or swelling. The symptoms can last anywhere from 10 minutes to two hours and it usually resolves on its own.