The number of med spas and hydration clinics has ballooned in recent years, turning into a $15 billion wellness industry offering a variety of services, from IV therapy to skin care and cosmetic procedures. Federal health officials and representatives of med spa owners warn consumers that, along with the boom, some facilities are using unlicensed workers to inject unapproved products in unsanitary conditions.

It’s difficult to know how many people have been injured at med spas, because the infections often are not reported to local or state health departments. But some infectious disease and emergency room doctors say they are seeing more adverse reactions associated with the facilities.

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