I have this same thing happen to me and it pisses me off. Seems to only happen on the most involved pieces at the worst time. I am certainly no chemist, but I have heard when you blow glass very very thin it changes the COE.
Im not sure if it poses any danger to cracking the piece, but it always looks like crap. The only way I have found to help this, is to not let the crap melt in. sometimes you have to jerk your hand out of the way quick, or it will melt into your piece even with the slightest flash. Then i just knock it off with tweezers, or pick it out with a 5mm rod.
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