You may be diligent about washing your face and applying your skincare, but one common mistake might be reintroducing breakout-causing bacteria to your freshly cleansed face.

“Be cautious in using cleansing tools like washcloths, sponges, or loofahs because they can be irritating to the skin,” dermatologist Joshua Zeichner previously told HuffPost. “Items like washcloths can be a breeding ground for microorganisms if they are left out wet and reused.” Zeichner is also an associate professor of dermatology and the director of cosmetic and clinical research in dermatology at Mount Sinai Hospital.