Thanks for all these additional information.
I understand your concern.
Well as you describe and your pictures suggest possible causes like Scabies,Eczema,Staph skin infection.
You should try OTC Zyrtec/Claritin 10 mg twice a day.
Also take cool water bath twice a day and keep the area dry and apply OTC Bacitracin ointment on affected area.
You should wear loose fitted clothes to prevent friction.
You should use abzorb powder if you have excessive sweating and itching.
You should avoid sharing any product,bed sheet,towel with any other person.
And see your dermatologist for a clinical examination for further evaluation and management.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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