Does Applying Vitamin E And Vaseline To The Red Rash In My Genital Area Help?

A red rash in my genital area just showed up on my left side and before I could treat it, the rash had a distinct odor like my flesh was decaying, after treating it with a ointment that my wife had received earlier from her doctor for a rash of some sort I applied it and the rash disappeared. Several days later the rash reappears but now its on my right side, its has distinct red line with some redness along side of it, I find that vaseline and a ointment I purchased with cortisone in it has helped, I just applied some vitamin E to the area to see if that would help the enfected area what do you think.