I recently came across a simple method using alum for skin tightening. You just mix a bit of alum powder with water or rose water to make a paste and apply it to your face—just not too close to the eyes. After leaving it on for about 10–15 minutes, it gives this tightening feeling, kind of like it’s shrinking your pores. Then you rinse it off with lukewarm water and use a moisturizer,... https://www.vedikroots.com/blogs/skin-and-hair-care/alum-for-skin