There are several types of Lasers in the market. For instance Argon, Electrolysis, Nd:Yag Laser,Ruby Laser, Pulsed Diode Array, Alexandrite & Light Sheer Diode Laser. All these lasers are used with varying effect on different skin types. All these LASERS have been reported to be helpful in various scientific papers. But this is entirely down to the expertise of the technician administering the treatment.