Lump On Viginia My Cat Has A Lump On His Left Side Of His Back Hip. It Doesn't Seem To Hurt Him When I Touch/squeeze It.?

My cat has a lump on his left side of his back hip. It doesn't seem to hurt him when i touch/squeeze it.? - lump on viginia

This is a solid, does not move and is the size of a walnut. Is it a tumor? We have recently discovered this ball about a week. I do not know how long you've been there.

I had a lump in the region before the operation. But the vet said it was just a piece of cloth. He disappeared after a while. Is that the same situation?