Back in the 60s, when I used to play surf/rock, by the end of the summer I'd always end up with a large "lump" (over-developed muscle?) between the thumb and index finger on my left hand. I'd also usually have a blister on the inside edge of my left thumb. During the winter when I wasn't playing as much they would both go away.
My most painful "drumming" injury didn't happen while playing, but certainly made playing difficult. I broke the toe next to my big toe on my right foot in a swimming pool "incident" the afternoon before I had to play. Needless to say, each beat on the kick that night was a real "delight"!