I have been practicing one hand riffling and bridging, i now have blisters/no skin on the inside of my index finger

has anyone else had blisters from practicing too much?
I have small hands so maybe this make things worse, i don't know.
Also, this maybe a weird question, but if you're right handed would you do this with your right hand?
I'm right handed and i do all my one handed stuff with my left hand (i only noticed this today because I'm a moron)