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    Isotretinoin's discovery and development series






    Dermatology Times editorial advisor, Dr. Elaine Siegfried and Jim Leyden, M.D., emeritus professor of dermatology at the University of Pennsylvania discuss distinguishing sinus tracts or keratinous cysts from nodular areas of inflammation and techniques for treating via intralesional injection.

    READ: Full interview

    Elaine Siegfried, M.D.
    Elaine Siegfried, M.D., is professor of pediatrics and dermatology, Saint Louis University Health Sciences Center, St. Louis, Mo. She ...


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