Hi,
If you've had him 2 months it isn't IBD.
It sounds like mites for almost all the rest of it.
And God knows why people keep recommending treatments that have been known to kill animals - I try and correct it every time I see it.
There was one yesterday in fact. When there was nothing better it was common practice to make up a home treatment and risk it. I like the fact we don't have to do that any more.
dr del