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You seem to have developed a fungal infection of the groin region, which can be either tinea
infection or candidiasis
You should try to keep the groin region clean and dry .
Do not apply any kind of oils or moisturizing creams over the groin region .
Wear cotton undergarments inorder to reduce sweating.
You need to use an antifungal agent like Clotrimazole gel over the affected area twice a day.
Also take oral antifungals like fluconazole
like 150 mg once a week for upto 6 weeks.
And to relieve the itching, take oral antihistamines .
Hope it helps,
Dr Geetika Paul
MD ( Dermatology)