I'm only just starting jogging again after surgery. So I decided to marshal at the Stockport 10 this last weekend. Really surprised by how enjoyable it was to do. And by the number of runners who were able to spare the breath to say thanks. I'm hoping I'll be running it next year but I'll definitely marshal again at some point.
Dactacort does a similar job as Canistewn HCl and doesn't colour the skin in my experience. There is a cream over the counter, or an ointment from the doctor. The ointment works better but causes grease marks on clothes and sticks to hair.
Check for rubbing seams on tops and bras. Without wanting to fuel the beasts discussion above, I find bras which are more like normal bras (lift and separate) allow air to circulate more than the compression type. And showering as soon as possible, or at least changing out of sweaty kit.
If it is fungal, washing kit as hot as it will cope with will help.