In 1992, OSHA issued regulations, called the Bloodborne Pathogen Act, for the protection of employees from infection by bloodborne pathogens. 
     Medical Spas have bigger responsibilities and liabilities than other types of spas because of the appliances they might have as well as requirements towards certain germs, like the Blood borne Pathogen.On a daily basis, estheticians work around six mucous membranes, as well as when performing extractions during facial treatments, and waxing axillary and bikini areas. Following strict sterilization and disinfection techniques is important not only for our clients, but for our own protection.
    BLS Statistics-  More and more Massage Therapists are being hired in spas.Employment of massage therapists is expected to increase by 19 percent from 2008 to 2018, faster than the average for all occupations. Employment will grow as more people learn about the benefits of massage therapy. Different types of Spas exist; whether it's a regular pampering Day Spa, Mineral Spring Spa, Medical Spas, etc. 
      Massage therapists held about 122,400 jobs in 2009. About 57 percent were self-employed. Many more people practice massage therapy as a secondary source of income. Of those who were self-employed, most owned their own businesses or worked as independent contractors. Others found employment in personal care services establishments, the offices of physicians and chiropractors, fitness and recreational sports centers and hotels 
  
http://www.massagetherapy.com/articles/index.php/article_id/1143/OSHA-Bloodborne-Pathogen-Act

http://www.massagetherapy.com/articles/index.php/article_id/478/Medical-Spas 
http://www.bls.gov/oco/ocos295.htm#emply
http://spas.about.com/od/medispas/a/medicalspa.htm 
http://spas.about.com/cs/spa101/a/typesofspas.htm