... 4, No need of special care after treatment. 5, For different types of skin, no negative effects. 6, ... Promote metabolism, accelerate blood circulation, improve skin moisture, increase skin collagen, increase skin elasticity and smooth fine wrinkles.Blue LightWavelength ... purify the skin, activate cells, promote the synthesis of protein and collagenCooling: air cooling Alice PDT (LED) Skin Care PDT-B8 ...