Repair StitchI started knitting a pair of socks for my dad late last night in low light and didn't see that I had accidentally split a stitch in the first round until the next morning when it glared at me in daylight. I had completed six or seven rounds by this time. No problem; this is very quick to correct with a crochet needle and a couple of minutes' time. Read more ... for illustrated instructions.
Correcting a Stitch
This method of correction involves creating a run to get down to the stitch in question, be it a purl or knit stitch. Start by knitting around to the column that contains the problem stitch. Remove the stitch (or stitches) from the left hand needle, but leave all other stitches on your circular needle(s). Stitches are always picked up from the "knit" side, so if a purl stitch is face outwards, the loops are picked up from the inside of the sock cuff.