A few weeks ago, I noticed Dewey had a little bump on his side, but he wouldn’t really let me get a look at it and I assumed he got it wrestling with the other cats. They often scrape each other up a little, exchange little toothy marks, that sort of thing.
He snuggled up to me now, and I felt it again - it’s about the size of a pea, under the skin but moving with the skin. Doesn’t seem to be tender or bothering him in any way. His fur is thick but it doesn’t look like there’s anything different about the area externally. It’s on his side a few inches to the rear of his armpit.
Obviously I won’t take him in until Monday, since it’s been there a couple weeks and hasn’t grown a second head and tail yet. Is it nothing, though, or something?