Several things here. First, I'd have your fit checked. If your fit is wrong or you grip, the resulting friction exiting the holes will cause your fingers to swell.
If you usually eat before or while you bowl, that will also cause your fingers to swell.
If you drink a lot while you bowl, especially beer, that could also be a cause.
However, if your hand swelled so much you couldn't even get your fingers in the holes . . that's a little more extreme. Were you possibly having a slight allergic reaction to something?