Gusset holes can show up in all sorts of places in your knitting, such as the base of fingers, the sides of heels, and under the arms. There are many ways to take care of them. Here is mine:
How to Close up a Gusset Hole After the Knitting is Done
Turn to the wrong side of the work. Using a yarn tail and a tapestry needle, weave through the sides of all the stitches that border your gusset hole.
Continue working all the way around the circle.
Then pull the yarn tail until the hole closes up.
Pull it firmly but not super-tight. Then weave in the rest of that tail.
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