As you may know from my previous threads, we have several outside cats which we've "adopted" - we got them fixed and current on their shots, feed them a couple times a day, and leave them to their own devices from there.
I noticed that one of them had something funky on her mouth; I had the wife grab and hold her and I took a pic; sorry for the poor quality, but this squirmy little sucker was not a willing subject.
What is going on here? What would one do about it? I'm reluctant to spend money on semi-feral cats. It doesn't seem to be slowing her down much at all; she's still eating and drinking as normal.