My outside cat, Agatha P., has Feline Leukemia and had to have surgery to remove a most likely malignant mass from her chest about 3 wks ago.  She's recovered wonderfully well, even gaining a pound over the last 10 days, and her incision is healing well, which can be a problem with her condition.  It's getting time to let her back out since she's better and going insane, however, her fur hasn't even started to grow back where it was shaved for surgery, and I"m worried she'll get scratched or injured on the unprotected skin.  Anyone have any ideas?  Anything topical would have to be non-toxic and oral meds aren't gonna happen.  I still have scars from administering her pain meds.

I haven't had a cat since high school in the dark ages (I've become allergic to them ).  However, a couple of ideas come to mind.  Vitamin E (prick open a capsule) rubbed on skin/scars helps them heal - at least on humans. 

Last summer when my dog had surgery on his chest and had a drain in we put a T shirt on him to keep him from messing with it.  Now, he is an old dog so his activity level is pretty low, and being a dog he wasn't going to climb trees, etc.  But I wonder if you had a snug fitting "shirt" (maybe a small dog sweater? or a preemie T shirt) if that would help?  Just worried about what might catch if she tries to climb trees, etc.

You could ask the vet, too.  They should have a good idea -- maybe you don't need to do anything, she may be more cautious just because of the tenderness over the site.

Update on Agatha:

I let her back outside last week and she's doing well.  Some fur is finally growing back and I hope she's weather-proof again by winter.

My wife has two cats who do not go outside at all.

Any veterinarian will tell you that a cat will live longer if they stay indoors even though I know cats love to be outside.
We live in town so a city cat has extra dangers like vehicles, dogs and people.
And, we have a leash law but most people either don't know about it or just don't care since I see more cats than any other animal running loose here.

I don't know as much about cats as some people but if a person lives in a city and has a cat it would be a good idea to keep it indoors.

I didn't answer your question but that is my two cents worth

Jerry