For the past 90 days I have been putting small labels around hoses (like ones you see on extension cords)and for past week have gone into work with no bruises on my right hand and half way through shift began to notice bruising between thumb and index finger and on top of hand by thumb and index finger (the 2 fingers I'm using). After leaving work the bruising slowly went away and was gone within 4-5 hours. The next day at work it happened again and again. This does not happen at home if I pull weeds or clean. Very strange. Upon seeing my hand the plant manager let me go. It cant be bruising when it goes away before the next day. Anyone have any idea? Is it overuse of my thumb and index finger?