A trick i use a lot on my fingering hand is to coat my fingertips with superglue, and let it dry to a hard shell. when your fingers are raw from playing too much (as mine often get), you can do a lil dab of super glue, and your fingers will be armor-plated, enough to get you through a set or another practice session. I don't know if the results will be similar with the picking hand, but hey, give it a shot.
just remember not to touch anything before the glue dries.