>inb4 call the vet (I have) Anybody here use Seresto collars?

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>inb4 call the vet (I have)

Anybody here use Seresto collars? Do allergic reactions look like this for them?

My cat has had food allergies (the vet thinks) for a while, but he's had two bald spots near his shoulder blades show up recently even on his 'restricted diet' food the vet recommended. Now this two-quarter sized waxy, scabby, flaky spot's shown up - but only on the back of his neck, near the two bald spots that are healing. It does not circle his neck, and I don't see irritation elsewhere. He's had the collar a week or so.

I come to /an/ because his case doesn't seem like an answer I can easily find online. Since we only see the bald spots near the back of neck/collar bones instead of his head, I thought maybe it's from a flea allergic reaction? So I'm stuck between leaving the collar on and risking it if it's the problem, or taking it off and risking a worse reaction from more flea bites.

The bald spots existed before the collar, but the two-quarter one did not.