1, need space: scalp healing needs some time and a good environment. In the process of sewing, using double-line knot will form a dead space at the knot, which provides a breeding environment for bacteria, thus increasing the risk of infection, while single-line knot can avoid this situation.

2, reduce irritation: too many knots will cause irritation to the scalp, causing pain and discomfort, and even hinder the healing of the scalp.