Yes, it's true, more than 50 million Americans suffer from acne. Differin consulting dermatologist, Dr. Melissa K. Levin, says often many people don't realize the foundation of acne treatment lies within a retinoid. This ingredient has been used and prescribed by dermatologists for decades, but now, it's available over-the-counter, making at-home treatment much easier. Dr. Levin fills us in on how retinoids can revolutionize how you treat your acne.