Treat and clear acne with PanOxyl Adapalene 0.1% Leave-On Gel. Adapalene USP was the first FDA-approved over-the-counter topical retinoid or acne treatment. This powerful acne treatment gel was previously available only by prescription. Now, the dermatologist developed and tested formula is available over the counter in an easy, once-daily leave-on treatment. The formula is Oil…