I was in my barn ,in my horse stall, when as I sat down on a chair I felt this extreme very painful pain on the end of my thumb. Wow, it hurt like heck for about 15 to 20 mins, only one tiny spot, and no bug, spider, or anything was around. I felt lessor pain for about 3-4hrs later and begin to notice that my thumb was swelling, no itching, no color change, no bump, or drainage, just getting warm to hot and swelling. It's been about 8 hrs now and my thumb is about half again as big as my other thumb. Odd, can't indentfy the bitter/stinger, from the net so guess I'll have to wait till morning to see whats doing then. Just thought I would put this out in case someone else had the same symptoms, what bit/stung you?