As Dr Huo stated below, since the laser does not break through the skin, it is super unlikely to give you any risk of keloids. it is a great laser for melasma and sun damage. you should plan 3 treatments, each spaced one month apart. use a good sunblock. If you have any ethnicity to your skin, then you should pre treat for 2-3 weeks with HQ. The Picosure laser is great because there is little to no downtime.david berman md