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this sounds like a fungal infection skin rash under the breast and arm pits and groin area.
you need to keep these areas dry using antifungal powders and sprays 4 times a day for 4-6 weeks
it can take many weeks to kill skin fungal infections.
don't use creams in moist areas.
use antifungal powders like nystatin powder or clotrimazole powder or ketoconizole powder.