Our cat, Mimi, has had a lump on her right shoulder for about a year now. We did some research when it first appeared and found out that this was common for older calicos and thought nothing of it since it was fairly simetrical and it didn't seem to be bothering her.
Fast forward to now... the lump is much larger and she is constantly messing with it as if it's bothering her. She's even licked the top of it raw. She is also much more vocal than usual which, if you have ever met Mimi, you know that this means near constant yowling.
We took her to the vet and they told us she needed surgery. So, they took some blood work to make sure there were no underlying medical conditions that could cause complications with the anesthesia or proceedure itself. The results came back today and she is good to go. We are taking her in tomorrow around 9am to have the lump removed and then sent to an outside lab to be analyzed. With any luck it will be that simple and there will be no further complications.
Our vet is optimistic but, since Mimi is an older cat (15 years old to be exact) surgery in general is going to be rough on her. We should have her back Thursday morning. Please keep her in your thoughts and prayers.