You shouldn't use the Neosporin either. It won't really do much. I have mixed feelings about the sock. It just takes time for the ivermectin to kick in. Personally, in severe mites cases, I apply a little bit of ivermectin topically each day in addition to the oral dose for the first week until the very hurtful itching subsides.
Here is a photo album documenting the worst two I've had:
http://imageevent.com/cavyspirit/cavyspiritpoorpiggies and here is the associated thread with the history (it's very, very long):
http://www.guinealynx.info/forums/viewtopic.php?t=558
See this link on Ivermectin:
http://www.guinealynx.info/ivermectin.html