There's a cool product called New-Skin. It's basically like putting superglue on a blister. It is an extra layer of protection, it's antiseptic, it makes the skin slicker, so the blisters tend not to get worse, etc. Basically, It's GREAT preventative, and a good cure. Your local drugstore will likely have it on the shelf. One word of advise, don't try putting it on an open wound. It won't make it infected or anything, it just burns like a mother as it has alcohol in it.