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