Well everyone knows where their strings and thumb come in contact when they slap right? Well right on that joint is really painful when i slap. I dont slap hard at all, yet every time i do it, i cant slap more than 3 or 4 notes without having to stop in pain. Im not sure weather or not its bruised. There is no purple skin like the typical bruise, just the thin callous i normally have. Anyone have any ideas on what i can do?