Acne responds to Alum. Alum stone is most often used for this purpose in the northern regions of Cameroon, as well as in some parts of Nigeria. It is an easy and effective treatment against Lice in the Hair. Admittedly, he said he's heard some young women say they use it to shrink the opening of their vagina, especially if they Is alum used for sex to keep their partners satisfied or reinstate the opening to its original size after having multiple partners that they don't want their partner to know about. You are not advised to take alum. Dissolve some Alum in hot water.