Sometimes if that happens, I can let the bead cool a little bit, then working far out in the flame, gently heat it up again to allow the surface to "heal" a little. I can't hurry it, have to go slow to allow the glass to flow into the pinholes and heal over, at least to a good extent.
And like Alli said, some colors are more prone to it than others. And working farther out usually helps avoid the problem, as does not getting the glass quite so hot.
Oh, and for the beads you already made, you could try etching them to see if you are happier with them that way.
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My current "hot" fantasy involves a senior discount on glass & tools!
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