It's better not to be too long. 15-20 minutes is enough. If the time is too long, it will block pores and affect the normal breathing of the skin. Watch DIY twice a week at most: mash the peeled potatoes in the juicer and brush them on your face with a mask brush. It is said that starch can also absorb oil. Potatoes contain a lot of vitamins and starch. Putting potatoes on your face is equivalent to making a flour mask. If you put potato chips on your face, when you take them away, starch will remain on your face, which will dry after a while and your skin will be uncomfortable, so you must wash your face after applying them. Remember to use warm water first, then cold water after washing, which will help shrink pores and prevent dirt from blocking pores ... just wash your face and do the usual maintenance procedure.