Sometimes if you accidentally knit into the stitch below, or do an accidental decrease, you leave a hole. You can let the stitch (or 2 if it involves 2 stitches) unravel down to that spot and see if fixing the column of stitches with a crochet hook will fix the problem. If not, you can always sew it closed on the back.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry