Limewater, having a pH above 12, will corrode tissue if exposed long enough. For example, the triglycerides in your skin are readily converted into fatty acids (soap) under these conditions. That's why it and other high pH solutions feel slippery.
But no, it should not cause numbing that I'm aware of.
Lay off the computer and vidiot box for a while there Mr. Mouse. Take it from a 27 year old looking at getting Zipper's in his wrists. Repetitive Stress Syndrome (better known to some as Carpel Tunnel) is some serious ****. You don't wanna be crippled by arthritis in 5 years because of Super Mario 2, that's for sure.