Tretinoin by OBAGI Medical is a prescription-only, physician-formulated treatment available in cream (0.025%, 0.05%, 0.1%) and gel (0.05%) strengths, clinically proven to accelerate cell turnover, improve acne, smooth texture, fade hyperpigmentation, and reduce fine lines—though it may cause initial irritation and increases sun sensitivity, so nightly application and diligent sun protection are essential