No provision of this chapter shall be construed to confer any authority to practice medicine or surgery; nor shall this chapter prohibit the practice of electrology by a person licensed to practice the healing arts or a person employed in a hospital or in the office of a licensed physician under such physician’s immediate direction; nor shall this chapter prohibit the use of nonelectrical cosmetic devices or the use of wax or other proprietary depilatories used for the temporary removal of superfluous hair from the surface of the skin.