Jock itch does usually go away on it's own without any treatment however it's best to treat the jock itch with some cream for the fungi that is causing the jock itch.
But you can also use some apple cider vinegar in a bath or use some Listerine or Apple Cider Vinegar applied to the area where your jock itch is.
I soaked in a bathtub of water and 2 cups of apple cider vinegar and the jock itch went away within a couple of weeks of taking a daily bath with apple cider vinegar.
You can also apply some Listerine to the jock itch which also helps to kill the fungi that causes the jock itch.
Also be sure to avoid any intercourse with someone because Jock Itch can spread through intercourse.