The purpose of using facial masks is typically to tighten loose skin. In this understanding, tightness and looseness are descriptions of the skin. Tightening masks and loosening masks can be interpreted as serving the function of achieving tightened skin or addressing issues of looseness, respectively. Both aim at the same goal. The title of this piece, "Tightening Mask and Loosening Mask," may correspond to a seemingly normal facial mask and one with a loose shape, but it does not necessarily reflect the practical usage in real life.