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George Y. Liu

Lead researcher; Professor and Chief of Pediatric Infectious Diseases, UC San Diego School of Medicine

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Researchers identify why the same skin bacterium causes acne in some people but not others

New Capabilities

Leading preclinical development of selective acne vaccine

Nearly a billion people worldwide have acne, and for decades, the best medicine could offer was topical creams that irritate skin, antibiotics that breed resistance, or a powerful drug — isotretinoin — that causes birth defects. On December 5, 2023, researchers at UC San Diego published a finding that reframes the problem entirely: the bacterium living on every human face produces two versions of the same enzyme, and which version dominates determines whether skin stays clear or breaks out.

Updated 3 hours ago