Hey there. So sorry to hear your kitty is having skin problems. Could you please post pictures of your kitty standing up and turned to the side so I can take a look at his over-all body habitus?
As the other members here already stated, any time a cat with diabetes has large wounds without any obvious trauma, we worry about Cushing's disease. My Frosty started having mysterious skin tears similar to your kitty about 4 months after I adopted him (he was 9 years old). Although it's difficult to tell from the look of the tears whether or not it's Cushing's, the history and the over-all cat appearance can give us clues. Frosty would groom and literally pull out skin with his fur. His wounds were pretty large, although I did not take any pictures of them because it was too upsetting for me.
Other things that can be notable about a kitty with Cushing's: thinning fur, "unkept appearance" of the fur (as if the kitty hasn't groomed or been brushed in a long time," and a pot belly with skinny arms/legs/back/shoulders. Here are some pictures of Frosty's appearance before he was treated with Vetoryl (a medication for Cushing's).
The "needle-like" fur is a pretty common finding in kitties wit Cushing's.
I am also posting more links to the Cushing's forum where I recently replied to someone else's post about possible Cushing's so you can read:
http://www.felinediabetes.com/FDMB/threads/vet-is-stumped-but-considering-cushings.210054/
My old posts about Frosty can be seen here (scroll down, they are from May):
http://www.felinediabetes.com/FDMB/forums/acromegaly-iaa-cushings-cats.12/
What I recommend is bringing up the possibility of Cushing's to your vet, and asking about the ACTH stimulation test to see if he has it. There are other ways to test as well, such as a urine test. Reading about it in Tuxedo Mom's post:
http://www.felinediabetes.com/FDMB/threads/vet-is-stumped-but-considering-cushings.210054/
Also, I recommend buying him a onesie to put on him to protect him from grooming and pulling out more skin and fur. Here is the one I used for Frosty:
https://keepdoggiesafe.com/products...aa-rI18vYd9qyA4nN0rY6qmAHGeGEosQaAnWWEALw_wcB
Here is a video of how to convert a regular baby onesie to a cat onesie:
Please keep us updated and let us know how your baby is doing. Again, I am sorry you're going through this. Unfortunately I have been there, as have a few others here on FDMB.
@Tuxedo Mom also had a kitty with Cushing's, and
@Rardito is currently the only member with a kitty who is living with Cushing's from this site as far as I know. Their kitties did not have skin tears.
