Fleas???

[Freedom]

What breed is she, and how old?

Any chance of photos, of Chica and of these bumps?

It does sounds like an allergic reaction. But more info will be helpful.

[Lucylocks]

take a blow dryer to her to see the skin and look for bugs. is she on a topical poison like frontline?
confortis is what is working , most others are not.
although i do not myself use any of those you need to first determine if there a re bugs. does the cat go outside? cat fleas love dogs. there is a difference, dog fleas do not like cats.
if no bugs then you ned to start the process of elimination of "allergens" in the environment outside and in. too many to list here.
then move to diet!