I have itches after every shower

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Every time after a shower, I have all the body which itches me. I tried everything (examination medical, towel(briefcase), soap, etc.) but nothing of all this can help me. Now, I found a solution a little speciale. I wash myself with some very warm water, what makes me perspire(transpire) a little after the shower, and increases my physical temperature. Since this, I have less itches. What do you think about this? It is a disease? If yes, how look after it?