... protein/collagen for skin 4.skin rejuvenat How does SK8 PDT LED machine for skin care work?Blue LightDestroy the survived condition of ... cells of human body. The visible blue light emitted by PDT can be perfectly absorbed by acne bacillus, and the metabolism ... , around 15 to 20 minutes per time. Application of PDT-4000 LED Alleviate oily acneAnti-aging, reduce fine lines and wrinkles, leaving ...