Always wash one's hands with soap and water.
Rings are funny things. You don't expect to lose weight in your hands, you know? And it's also a very dry, cool day (glorious! - I love this weather) which does cause finger shrinkage, too. So my rings (my wedding and engagement rings on my left hand, my turquoise one on my right - the only rings I wear, but I wear them all the time) are loose, and the stones are interfering with my typing. I thought about moving the turquoise to a different finger, but that won't work. The joints on on the first and middle fingers are somewhat swollen and I can't get the ring over them, and the pinky is obviously too small. I didn't even realize that about the joints in my first finger, but now that I compare them to my left hand, I can see it's true. It doesn't hurt, though, unlike the middle finger, so I don't think it's arthritis.
I do know that the last time I lost a significant amount of weight, about fifteen years ago, I lost the turquoise for awhile, and as it was a gift from my mother over 21 years ago, I don't want to do that again. And they don't resize silver for some reason.
Also, of course, it's probably the weather.