pdt facial beauty machine/ facial care led light therapy skin rejuvenation diode laser machine

what is skin rejuvenation led pdt light machine? 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. one of the original applications for leds was pdynamic therapy (pdt), using p-activated creams for the treatment of actinic keratosis and pre-cancerous lesions..syi