You sweat for a reason
What you need to know about embarrassing perspiration issues. Start by wearing looser workout gear, since rashes can be a result of friction from damp clothing, says Dr. Wu. And shower as soon as you can after each workout (or wipe down your face, chest and back with salicylic or glycolic acid pads). If the problem persists, try applying antiperspirant on your inner thighs and under your breasts to stave off rashes and chafing.