Emitting the 1550nm Erbium laser in factional way, and a noe-invasive,when it act on skin will not ablative but the energy can reach the deeper skin;with small energy,the skin tissue will rearrange and then can do skin rejuveration,skin tightening and wrinkle removal.With big energy will get excellent result of superficial scars removal,pigment removal and superficial chloasmas removal;1550nm erbium laser is only technology approved by FDA to effectively treat superficial chloasmas