Basic principle : Scar
Scars are areas of fibrous tissue (fibrosis) that replace normal skin after injury. A scar results from the biological process of wound repair in the skin and other tissues of the body. Thus, scarring is a natural part of the healing process. With the exception of very minor lesions, every wound (e.g., after accident, disease, or surgery) results in some degree of scarring. An exception to this are animals with complete regeneration, which regrow tissue without scar formation.
Scar tissue is composed of the same protein (collagen) as the tissue that it replaces, but the fiber composition of the protein is different; instead of a random basket weave formation of the collagen fibers found in normal tissue, in fibrosis the collagen cross-links and forms a pronounced alignment in a single direction. This collagen scar tissue alignment is usually of inferior functional quality to the normal collagen randomized alignment.
How does it work
1) Fractional laser
Fractional laser is a laser that induces dermal coagulative injury without damages in the epidermis, and has lesser skin damage risks and shorter downtime compared to commonly-used invasive lasers. Since the fractional laser works under the principle of producing a microscopic thermal wound within the dermal tissue, it contracts tissues and stimulates collagen to stimulate quick wound recovery
Reference: Tierney EP, Eisen RF, Hanke CW. Fractionated CO2 laser skin rejuvenation. Dermatol Ther. 2011 Jan-Feb;24(1):41-53.
2) Fractional RF
Non-invasive fractional RF delivers RF energy into the dermis without damage to the skin surface. RF energy that has been transferred to the skin dermis converts to thermal energy, and converted thermal energy is accumulated more in inferior dermis than in epidermis. This thus induces the production of new collagen without damage to the skin surface.
Reference: Brightman L, Goldman MP, Taub AF. Sublative rejuvenation: experience with a new fractional radiofrequency system for skin rejuvenation and repair. J Drugs Dermatol. 2009 Nov;8(11 Suppl):s9-13.