I do brazilian jiu-itsu as well... and have experinced many rashes. About the ringworm... if it's ringworm it will itch A LOT, i had it twice at a school that didn't take very good care of it's mats, when you have it you'll know it.
I've also gotten other rashes that weren't from a disease, but from the general rubbing of the clothes combined with the sweat against the skin. Something that may be worth trying is buyingsome sort of underwear that let's moisture pass through and doesn't rub against you. I wear under-armour underwear while grappling to avoid this. But of course, to be really sure you should consult a doctor.
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"A casual stroll through the lunatic asylum shows us that faith proves nothing." - Friedrich Nietzsche
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