Suggest Remedy For Blisters

Two days ago, I went to my doctor to have a cluster of small warts removed by liquid nitrogen. At the time, I was unaware of the effect the liquid nitrogen would have on my skin. Now, I have a massive blister where the procedure was done. It is the size of a cherry tomato and is about to join with another smaller one next to it. I'm aware that blisters are the intended effect of the liquid nitrogen, but are they supposed to get this big? It is on my right hand, and has made it virtually useless. If it isn't serious, and I don't need to see my doctor, how long will it be this large?