what is with this burning?!?!

Okay, Im not sure what is going on "down under" but maybe a few of you could shed some light:

I am 26, married, and in good health. I am not on any type of birth control and I exercise regularly and eat healthy. I have no medical problems nor do I take any type of medications.

However, for the past week I have had a mild burning down there. There isn't a smell, itch, discharge, nothing. I am not swollen or red down there either. However, the burn is enough to be annoying and keep me up at night, it is more uncomfortable than painful. It isn't a UTI, I get those enough to know when I have one.

Any suggestions?