DD used to get lots of wrist rips. The number one thing to prevent them for us is to WASH HER WRISTBANDS REGULARLY! This seems simple, but it made a huge difference for DD.
When she has the rips she uses those little gel pads (I think the ones she has are called second skin or something but they are in her locker at the gym so I am not sure). Put one or more on the rip (depending on the size of the rip), wrap it with athletic tape to keep in place, and that is it. They keep the rip protected while at gym. At home and at night she just keeps it clean, and as it dries up and skin gets hard we trim it off with cuticle scissors.
Hope that helps!