Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
When did this start?
Is he an indoor only cat?
Any other pets in the house?
Approximately three weeks ago... He is a cat that commutes and spends time both inside and out... The only other animals are fish... I live alone... I have been trying to adopt some feral cats and get them spade...
With that in mind, I am going to list causes to consider.
The most common causes for this, especially in a cat that can go outside (even for a brief period of time) include:1) Infectious causes:- Bacteria- Mites- Fleas2) Going back to the topic above - FLEAS and flea allergy dermatitis (not just the fleas themselves...) but the ALLERGY with cats associated with just one flea bite can be quite intense.Moreover, for some of these cases, as you describe the skin above, they have an allergy that starts...but the scratching causes a secondary infection that then needs antibiotics - as the bacterial infection alone then keeps the cycle of scratching going...EVEN if the allergic stimulus is no longer present.3) There are some cats which overgroom due to internal reasons - and the most common one would be an overactive thyroid. 4) Environmental as well as food allergies can cause these signs as well, again - especially environmental even if going outside.For allergies, whether flea, food, or environment, options include:- Steroids (Prednisone - LINK HERE)- Antihistamines such as Benadryl (LINK HERE) or Loratidine (LINK HERE).IF diet is a concern - then a hypoallergenic diet example that is common to use in cats is Hill's Z/D (LINK HERE)Finally - there are some cats that scratch - and there is just no cause we can identify....For these cats, it is thought that OCD/behavioral/anxiety related issues are the cause. (LINK HERE)For that as well, they can benefit from steroid injections - but owners also find it beneficial to consider a product called Feliway - LINK HERE or a calming collar (LINK HERE) which emits phermones/hormones that are supposed to decrease stress or anxiety in cats. I hope this helps!If you have any follow-up questions - please do not hesitate to ask!Otherwise - please remember to click ACCEPTFind me any time if needed: http://www.justanswer.com/veterinary/expert-criticalcarevetYou can always request me through my profile, bookmark my page for future help, or beginning your question with “For CriticalCareVet”