sweat is an emissions process as much as it is a regulatory process. the human body can handle heat regulation when you've got antiperspirant on because the rest of the body can still sweat to cool itself. but the lymph nodes and other glands in the armpit do excrete some mildly toxic compounds that build up in the body and are not effectively excreted elsewhere except for in the groin. this is why groin and armpit sweat smell so different from body sweat, it's because there's a bunch of other crap in it that is being filtered and excreted. antiperspirant blocks all that in, and that's :sonic-thats-no-good: