I hope Romeo feels better soon, but it may take what seems like a long time (because we want it to happen instantly). Whenever I think it has been too long, I alway call the vet and innocently ask" I forgot to ask, but how long should it take for him to be feeling better?" This way they won't automatically say bring him in (which I think vets tend to do). As for a bath, I am a gromer and 9 weeks is fine but wait until he is well because he could get chilled being wet and if his immune system is compromised he could relapse. The matted areas may need to get shaved because using a scissors to cut mats out of a cat is dangerous!!! My Amber got that matted under the chin area when she was a sick kitten and we just shaved what what necessary and let it grow back in. Good luck with Romeo.