What creams are you useing for the irritation at the moment?
Also how often are you aplying them (if it's vet stuff)??
If you can mix Tea Tree oil in with Sudocream (?sp) and apply as much as needed, inbetween other vet cream (if you are useing it).
This works wounders to ease the icthing, it may not/wont clear it but it will help the ichting, its cheap and efective, we use it often on our old dog who has bursts of flea allergies.
Please try it and tell me if it has any efects.
PS i very much hope you solve this problem.
Ky and Rio