Every winter, I get weird bumps on my knuckles that are usually red and painful to the touch. They don't look or feel like blisters and there isn't any pus or anything. It's just small swollen bumps on my knuckles that hurt if I accidentally touch them. I have no idea why it happens or what it is, though I'm assuming it's got something to do with the cold, since I only ever get them in winter. I also live in a pretty cold place, where normal winter temperatures are around -6 degrees Celsius, or sometimes lower.

Anyway, so I'm just wondering if anyone has any idea what it might be? Since they aren't like an injury or infection or anything like that, so I'm at a bit of a loss.