Thanks for query.
It seems that you might have some infection like fungal as there is itching, or it might be dermatitis
or even it might be due to friction.
Nothing to worry, it is curable.
Go for one short course of antibiotic as there is a chance of infection due to itching.
Take antihistamine like Cetrizine
Apply triple action cream on the part.
Keep local part clean, dry and airy.
Ok and bye.