Ouch! That looks like it hurt! That could get infected very easily. It may start hurting again when the blister breaks. I believe that is a second degree burn. It can take up to 48 hours to see the full extent of the burn, and this can get infected very easily. It may be a good idea to give your doc a call and check to see if he would recommend putting antibiotic ointment on it. Some docs will give you a prescription for silvadene creme which may help with potential scarring. So sorry you got burned so nastily.