jww wrote:Remember that with alum you must rinse well after using it. Best to let is sit on your skin for a minute or two while you clean up, whatever, then rinse really, really well. You shouldn't have the prickly feeling if you have rinsed well. If you do rinse and still have problems, then it's likely a reaction. I know that I can use alum on my face without problem, but can't use it under my arms at all because of the stinging and some issues with rashes. Go figure -- I am not a dermatologist, so have no idea why this is, but it matters not -- alum still works fine for my shaving.
I agree...rinsing a minute or so after using alum is best. I see a lot of posts where people who don't rinse well get some irritation after a few days.