I am concerned about a few possible causes of the skin irritation you are seeing. The first would be a parasite infestation (such as mites or ringworm
). A skin scrape and a culture for ringworm fungus would need to be performed by your vet in order to look at the skin cells under the microscope and determine if there is evidence of parasite infestation. The next possibility is an auto-immune skin disease called pemphigus which can show up in any age cat and can cause skin lesions
around the face, abdomen and/or nail beds. This disease can also (often) be diagnosed with a skin scrape but sometimes skin biopsies are needed to make an absolute determination.
The next possible cause would be an allergy to something in his environment. In particular food
allergy can cause profound skin lesions (usually these areas are very itchy however). Food allergy can arise in any age pet and is most common in pets that have been fed the same food for an extended period of time, but can happen at any time.
The last possible cause unfortunately could be a form of skin cancer. Usually biopsies are needed to make a determination if this is the case.
With any of the possible causes I've mentioned, there can be bacterial or yeast infection of the skin playing a role in the signs you are seeing which would require treatment with antibiotics and/or antifungal respectively.
I hope this helps. Please let me know if you have further questions on any of these topics. I'll be curious to see what the vet finds.