The following persons are exempt from the provisions of this chapter, wholly in the proper discharge of their professional duties, to wit:
Persons authorized by the law of Mississippi to practice medicine and surgery.
Commissioned medical or surgical officers of the United States Army, Navy or Marine hospital service.
Registered nurses.
Cosmetologists, and nothing in this chapter shall affect the jurisdiction of the State Board of Cosmetology.
The provision of this section shall not be construed to authorize any of the persons exempted to shave, trim the beard, or cut the hair of any person, or perform any other act that constitutes barbering, for cosmetic purposes, with the exception of persons licensed by the State Board of Cosmetology.