Hi there. Thank you for posting your question with Healthcaremagic. I will do my best to help you.
What you described here is fungal skin infection
in crease or warm place. You need a good anti-fungal cream like Canesten
. You may even need to take an oral anti-fungal like Dulfastone. You will also need to check that you do not have early diabetic. Good luck.
I hope that I have answered your questions fully and been of some help. If you have anymore questions please contact me again anytime.
Dr Andrew Rynne.