by Dr. Steven Wallach
“Retin-A bulks up the skin so the chemicals can penetrate as evenly and effectively as possible,” says Steven Wallach, M.D., a New York City plastic surgeon who conducts pre- and postop skin-care seminars (“Basically ‘Everything You Ever Wanted To Know About Plastic Surgery but Were Afraid to Ask,’” he says with a laugh”) for aestheticians at leading Manhattan day spas like Frederic Fekkai Beaute de Provence and the Avon Centre.