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Tretinoin is a topical retinoid derived from vitamin A. It speeds up skin-cell turnover and helps prevent clogged pores, making it useful for acne and improving uneven skin texture. Chemically, it’s made of carbon, hydrogen, and oxygen atoms arranged into a retinoic-acid structure with a long conjugated chain and a carboxylic acid group. #tretinoin#skincare#acne#looks#skincaretips