Business has been brisk, Rudnick said, as the store benefits from foot traffic passing Williams-Sonoma or Tiffany's to get to Saks Fifth Avenue.

The concept: Slip in an appointment while spending the day shopping. On the other end of the county, Radiance Medspa is in the trendy Downtown at the Gardens shopping center in Palm Beach.

Such spas have emerged in malls, city office buildings and storefronts across the country but not without attention from legislators and medical associations. A new state law that took effect Saturday says dermatologists and plastic surgeons are the only specialists who can supervise medical spas.

Though other parts of the law affect primary care doctors, too, some say medical spas were the target. A medical supervisor can run no more than two offices offering mainly skin care, and by 2011 it would be only one.

"Cosmetic skin care is a growing industry and med spas are probably going to be a vital part of that growth," said Dr. Dan Meirson, a Pompano Beach dermatologist and immediate past president of the Florida Society of Dermatology and Dermatological Surgery.

The state dermatological society lobbied for the law to ensure doctors are involved in patient care. Rudnick, who began his business in Boston, said the law won't hurt his medical spas.

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