A stitch eraser is a tool used to remove stitches from embroidery. You can also use it for other types of stitch patterns. It looks like a small shaver used for trimming beards. Embroidery enthusiasts suggest using this tool for removing machine embroidered designs. The reason is that it is easier to control and can run through the fabric without damage. I do not recommend it for removing hand-stitched embroidery. The reason for that is because it can get stuck with large stitches and challenging to remove.