Hello, thanks for your health query on ATD.
The main causes of continuous scratching are use of too much or harsh soaps & the tight fitting underwear. Also, excessive sweating may release the remnants of detergents in your underwear. You should also understand that scrotal skin is thin & sensitive.
My advice avoid scratching. Use Hydrocortisone cream twice a day & avoid tight fitting jockey type of underwear.
Hope you will get relief.
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