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The why first, it is an astringent and has antiseptic properties. That is why is is beneficial to use after a shave, it helps to sooth and heal broken skin and protects it like neosporin.

I...

Everything pfries said and I include the armpits. I like to wet the alum, my face and hands and apply it to the whole face including my forehead, then the pits, then give it a rinse and set it aside....