Originally Posted by David_L_Brown
My quick and dirty trick in a situation like this is to make a duplicate layer and change the blending mode to darken. Then use either the gaussian blur or dust'n'scratches filter just enough to make the individual fly-away strands disappear. Just look at the problem areas and not at the rest of the photo 'cause its gonna look weird until you cover it with a black mask. Finish off with a white brush on the duplicate layer's mask just in the general area of the fly-aways. This is much simpler than it sounds and you can be fairly relaxed with your white brush. You certainly don't need to try to trace the individual hairs although you could but if you are going to that much trouble the aforementioned clone and healing options are preferable.
By the way, this trick works in reverse (lighten instead of darken) to get rid of stubble and other small dark undesirable irregularities.
Tried it on this image,,works great!!!! Good tip!!