Suggest A Remedy For Rash Like Cuts Between The Groin & Thigh

I have what lloks like an open very small cut in the crease between groin and thigh. It has been open for about 2 weeks. I can feel an occaissionally stinging feeling when I am actively moving around. I do sweat quite a bit especially down there and often have a dry scaley rash in the groin area for many years but the open cut in the crease is new.and I don't always shower right after going to gym...any ideas