Tretinoin, a topical retinoid, is a popular medication used to treat comedonal acne, blackheads and whiteheads. It is the acid form of vitamin A and works by increasing skin cell turnover and clearing blocked pores. The medication is available in cream or gel from under the following brand names: Stieva-A, Aberela, Atralin, Airol, Retin-A, Avita, Refissa and Renova.
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