Recurring Jock Itch and yeast infection

Hello,
I'm a 28 year old, uncircumcised male, active, not overweight, eat decently healthy (compared to most) and have had no serious health problems to date (except for this!)

Over the past two years or so I've had several recurring bouts with what seems to be a yeast infection, sometimes along with jock itch/ring worm. It seems to go away eventually, but lately it had persisted stubbornly. One occurrence a few months ago affected the scrotum. During that bout it quickly cleared up with some anti-fungal cream (tolnaftate).

As far as the yeast infection, I've read that it's not that common in men.
Is this simply a stubborn fungus or could there be something else going on? I get worried when I read about recurring fungal infections occurring as the result of a suppressed immune system, hiv etc.

What could be causing such troubles?

Thanks for your input.