Damn. I'm sorry to hear about that. And I thought little splinters in the pads of my thumbs were bad.Caution: Abrasive wheel can and do shatter. Those little wire break off and fly. I had one let loose I still have a 1" wire embedded under the skin in my belly. Glad I was wearing safety glasses.
Always stand to the side when starting your grinder. Use the guards and wear eye protection.
Daryl
MN