i am in my teenage years and suddenly a little blister appeared on my left hand index finger. i didn't think much of it so i ignored it. day by day the blisters spread to the inbetween parts of the next two fingers and to the fingers of my other hand. i can not pop these blisters and they do not itch but the pain they cause comes and goes. the pain is worst on my left hand and this is a problem because it is the hand that i write with, but it has not affected my writing yet. can anyone tell me what is wrong so i can sort it out before it spreads even more.