Thanks for writing to us.
You seem to be suffering from a condition known as bromohidrosis.
To treat the same
Use antibacterial triclosan
based soap or may continue with betadine
After bathing dry the area completely and use an antifungal dusting powder.
wear loose clothes and change your under wear atleast twice in a day
shave your pubic hair regularly
keep the area well ventilated
avoid onion, garlic or excessive protein foods
if you sweat excessively, you may also use an aluminium cholorohydrate based antiperspirant.
hope that would help you.