The booming medical spa industry is suffering some aches and pains. The diagnosis? Malpractice lawsuits. The prognosis? Not so good.

Plaintiffs and defense attorneys alike say medi-spas, where the beauty-conscious go to lose their unwanted facial hair, acne scars and fine lines, are a new litigation hot spot as patients increasingly sue over spa treatments gone wrong. Laser hair removal in particular is triggering lawsuits, lawyers note, warning that even more litigation is on the horizon as the number of medical spas has soared.