I'm not a doctor, but I believe it is quite possible for a blister to morph into an wound/open sore. "I'm beyond antsy," he said. "It's the (darndest) thing I've ever seen as far as skin. I can't explain it, and nobody here can explain it. I've been to several doctors, and I just haven't gotten any better. We tried just about everything we could think of and probably tried some things we shouldn't have. Time will be the best thing for it." Apparently several doctors can't explain it. No mention of a "popped blister" that just needs to heal. Instead it's "nobody can explain it."