confluent reticulate papillor

Hi, I'm a 20 year old female and I've had an ongoing skin rash since I was 13. Apparently it's called confluent reticulate papillor and it's under both armpits. It looks like brown scaly round spots that are linked together and it gives off a funny smell when I perspire. It also becomes worse when I'm run down or stressed. I've tried treatments such as nizoral, retreive cream and selsun that were recommended by a dermatologist but none seem to work. My dietician also thought it may be coeliac??  
The rash is very embarrassing and I'd be grateful for any help you could give me.