I went on a short, cold ride with DBF today. I got back in the nice, warm car and my fingers swelled up. So it's a reaction to getting cold. Makes sense, as the first two times it happened, I got cold drinks, and the third time, I was wearing fingerless gloves and carrying two very cold metal travel mugs, and my fingers swelled up once I got inside the apartment.

Sigh. Now I just need to figure out why my fingers are swelling up in the cold.