1. Your bra straps
Ever heard of acne mechanica? Well, it’s a type of acne triggered by excess heat, pressure, friction or the rubbing of skin, says cosmetic chemist Ron Robinson of Beautystat.com. “It can occur anywhere on your body, and anything that traps heat for a long period of time (ahem, like your bra straps, or even a bike helmet), rubs or puts…
