scabby like skin issues

So my cat whos under a year and only has 2 legs. Shes been getting tges scabby like bumps, they are whit le and very hard to see under the fur, you cant even tell they are there but she just needs petted all the time bc she cannot scratch, shes on grain free food which weve had her on for 8 months. She doesnt have any fleas and im afraid to add any preventative. I did give her a batg in hopes maybe it was something she came in contact with. It cant be the litter... and i just dont know. Theyre not red theyre white and not easy to scratch off no dander or excess skin. But its spreading and we are going to take her to the vet but its gonna be a little vit to get in. And she needs her regular vet due to her needs

My first thought is perhaps a food allergy, or another allergy of some sort.  Even grain-free can have some issues.  One of the cats here turned out to be allergic to fish.  Anyone with other thoughts?

Hang in there...your vet should be able to sort it out.

Yea i worked at a kennel and i feel so horrible the girl cant scratch and shes usually very independent but now shes a completely diff cat

If it is an allergy, Benadryl might help,but I have no clue what the dosage would be for a cat.  I know cats can take it, there are a couple on here who do.