I had jock itch for seven years, tried all the expensive creams and drugs and they all failed. So I decided to look for my own cure. My jock itch had been with me for 7 years, and extended from my genital area right around to my rectal area. Unpleasant.
I found out that the fungus causing jock itch or tinea cruris was exactly the same as tinea pedis or athlete's foot. So I started dusting my genitals and affected areas during the day with athletes foot powder(salicylic acid).
After about 6 days of this, and after my evening shower, I started to dab the area liberally with pure Milk of Magnesia(MoM) and left this on overnight and than washed it off in my shower in the morning. This protocol took just two days to wipe out my jock itch completely which was amazing.
MoM has a pH of 10 -- this highly alkaline pH will kill any bacteria, virus or fungus for sure. And MoM is very soothing and doesn't sting or cause itching. The MoM also has an extreme drying effect -- another property that kills all microbes -- so it is always worthwhile putting a hydrating cream on the MoM application area in the morning.
I've also read that MoM can also wipe out MRSA problems on the skin fairly easily.