Richard
The rash you have described sounds like a type of 'yeast-like' rash I get because of a VERY weakened immune system. They almost resemble being attacked by an Octopus. This type of infection loves the moist and warm areas, hence the reason it gets worse when you are keeping heavier clothing on during the winter. The clothing also allows the yeast to naturally spread itself with ease. A treatment with a cortisone ointment should clear this up in a week - 10 days. You should get itching results after a day. The patches will begin to flatten out after another day or so and then begin to fade.