Question

My cat has a lump a little smaller than a dime on her right shoulder blade. I noticed it a little over a month ago while I was combing her and it has grown. It is definitely under the skin, moves easily, irregular shape, but when I first found it it seemed more regular in shape. The skin covering the area appears normal, doesn't feel inflamed, hot etc., but she gets mad when I try to look at it for a long time. She is 12 yrs, and an indoor cat, we have no other pets. It couldn't be from a vaccination b/c our previous vet (we moved states) discouraged multiple vaccinations after kittenhood for indoor cats. I got her an appt. with the vet for next week, but we just moved so it's brand new vet and I would like to know some possibilities before we go in. Not to mention, she's the most affectionate little calico and a beloved member of our family, I want to be prepared before the visit for what the vet might say and, whether I should avoid taking my daughter if it's going to be bad news.