Thanks for giving us a try Jack! Please note that one of the leading reasons for irritation or discolouration in the underarm area is because of using too much product. Please ensure you're sticking to the recommended amount of 1/8" - 1/4" of product (max) per armpit. That's roughly the amount of a small pea (or less). In fact, we've found that a pea-sized dollop is generally enough to do BOTH underarms (half a pea per pit ;) Our deo is very effective and it really doesn't take very much, we always tell folks to use less than you think you need. Unfortunately, when you use too much, some people find the baking soda causes irritation or darkening of the skin. This is not permanent however, discontinue use for a few days and everything will go back to normal ;)