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PDT/LED is used for skin rejuvenation.
LED Skin Rejuvenation is the interaction of light, delivered through Light Emitting Diodes (LEDs), to activate cell receptors causing them to produce collagen or multiply. LEDs offer a totally natural, non-ablative method for  skin  rejuvenation.  The  light  from  the  LEDs  interacts  with  cells  and stimulates them to produce new collagen and elastin. Studies confirm that the same LED energy can be used to inhibit collagen formation, which can be helpful in the treatment of scars. By manipulating the wavelengths, cells can be  turned  on  and  off.  Yellow  and  Green  light  LEDs  are  used  for photo-rejuvenation. Blue light LEDs are used in the treatment of acne. Red light LEDs are used for PhotoDynamic therapy(PDT).