Welcome to Justanswer! I am Dr. Altman and happy to assist you both today!
I am so sorry Cleo was diagnosed with IMHA, it can be a frustrating diagnosis and it is always scary as a pet owner as veterinarian when we begin to taper the medications because, 1.) They can relapse, 2.) If they do relapse it is very difficult to gain control again
I would trust your veterinarian to taper when he/ she begins to feel it is time which can be several months
Yes the sores can be due to the high steroid and azathioprine use because its job is to suppress the immune system so that it doesn't attack its own cells and in doing so leaves the body open and susceptible to infection
Things you can do for the sores:
1.) No licking! If this area is reachable then please put a t-shirt on or a cone to prevent her from reaching the area. Licking introduces oral bacteria to the area and can increase risk of inflammation and infection
2.) Trim the hair around the sores
3.) Use ivory soap and water or dog oatmeal shampoo to the area twice daily with ten minute contact time before rinsing and tap dry. It may require a medicated shampoo to treat and resolve the sores and possibly oral antibiotics as well
4.) I prefer to not apply salves or ointments because it traps in moisture to the area and reduces healing or delays healing time. If needed you can put a very thin layer of a triple antibiotic on the area after cleaning
5.) Remove any scabbing that occurs with healing. Again it also traps in moisture and then can actually abscess
Please let me know if this information makes sense and any additional questions i can assist with or clarify today. I do understand your frustrations and often these medications are needed longterm in order to minimize risk of relapse. With your vet together you can determine the best way to minimize this risk but unfortunately it is the better of two options between the medications or risking relapse by tapering too soon...
If you have more questions or if I can help in any other way, please do not hesitate to ask! If you would like to accept my answer, please press RATE OUR CONVERSATION at the top of your screen (I am not compensated in any other way). Bonuses are always welcome. Thanks!