Hello. Thanks for writing to us at healthcaremagic This seems most likely to be a fungal infection of the groin (Tinea cruris). The location of the rash and itching goes in favor of this being a fungal infection. Groin folds are a common site of fungal infections; the anatomy being such that the folds trap moisture, which is conducive to fungal growth, specially in hot and humid weather of summers. I would suggest you to use an OTC topical antifungal e.g clotrimazole 1% cream, twice daily. An OTC oral antihistamine e.g cetrizine 10 mg once daily will provide you symptomatic relief from itching. General measures would include bathing twice daily, wearing loose fitting clothes and cotton undergarments. Regards