Thanks for writing your query.
Itching in the area described by you, are mainly due to fungal infection
You should keep your groin area clean and dry .
You can take tablet Flucanazole 150 mg stat along with one tablet of Fenofexadine
You can apply Ointment containing Betamehasone, Gentamycin
If the problem persists, get yourself examined by a Dermatologist
I hope this is helpful to you.