When your armpits stink what is good for it?

well, first of all, if you do lots of physical activity, then you just have an excessive amount of sweat building up. then you just wash it with a washcloth in warm water and put on deodorant. I suggest ones that don't block the sweat, because they're bad for you. It also depends on the age. If you are a young teenager, then it might be hormonal. then, just do the same thing but wear deodorant every day.