What are the safety and contraindications for various skincare treatments?

Cosmetologists are licensed and regulated in California by the Board of Barbering and Cosmetology. ... means the hair of any person. Cosmetologists may apply ... (C) "Beauty salon" means a salon in which an individual is authorized to engage in all branches of cosmetology. (D) "Biennial licensing period" means the two- ... 47(4) 48“Cosmetology” means the mechanical or chemical treatment of the head, face, and scalp for aesthetic rather than medical purposes, including, ... (6) “Cosmetologist” means any person licensed under this chapter who is not an apprentice or student practicing cosmetology, who shall have the qualifications ... Apprentice salon, defined. Apprentice salon means a cosmetology salon licensed under the Cosmetology, Electrology, Esthetics, Nail. Technology, and Body Art ... noun cos· me· tol· o· gy ˌkäz-mə-ˈtä-lə-jē : the cosmetic treatment of the skin, hair, and nails Examples of cosmetology in a Sentence (7) "Cosmetologist" means a person licensed to practice cosmetology as defined in this section. (8) "Cosmetology" means any one (1) or any combination of ... (3) “Apprentice” means a person who is learning the practice of barbering or cosmetology under s. 454.10. 454.01(5m)(5m) “Barbering” has the meaning given in s ... the study and application of beauty treatment. Branches of specialty include hairstyling, skin care, cosmetics, manicures/pedicures, non-permanent hair removal Cosmetology defined. Any one or any combination of the following practices constitutes the practice of cosmetology when done for cosmetic or beautifying ...