For people with acne on the back, you can rub fine salt on the back when you take a bath early to gradually alleviate this problem. Rinse your back with hot water to open your pores, then apply fine salt to your back and gently wash it with a bath brush to make the salt move more evenly between your skin. After washing with water, you can see that the acne on your back is smooth!
The edible salt used now mainly contains sodium chloride and a small amount of potassium iodide. If mixed with salt water, it has bactericidal effect. It is ok to clean the skin. It's just that the concentration should not be too high, and it is generally about 1%. Too high will dehydrate the skin.