Lump on cat's back

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Just posting for advice please.

I discovered a lump on my cat's back last night. She's 12 years old and a ragdoll. It's slightly smaller than pea-sized and hard, and doesn't appear to be causing her any pain. A quick Google search says it's probably fine, but I'm thinking it might be better to get it checked next week? I've been worrying ever since.

So she never goes out? My 1st thought would always be an abscess, but not if she never goes out. I bet cats can get fatty lumps like people do, too, and ragdolls run to big ime.

No, she never goes out.