The Solution: If you're noticing a correlation between exercising more and body acne, it's not your workout that's to blame, but rather your workout clothes. Specifically, your Spandex. It traps sweat, which can lead to skin irritation and body acne. Natural fabrics like cotton, or lighter materials specifically designed for workouts like Lululemon's Luon are much more breathable, but still designed for working out.

If you're still suffering from spots on your back and chest, Day recommends seeing your dermatologist for the prescription acne medication ACZONE. "Its lightweight formula doesn't stain so it can be worn under your gym clothes," says Day. "Plus, the anti-inflammatory properties will keep pimples from popping up due to acne-triggers like friction and sweat."