Does laser hair removal work on every colour of skin?

Long pulse and diode types of lasers work best on light-colored skin. Since laser works by being attracted to and targeting the dark pigment, using an alexandrite or a diode laser on darker skin can result in skin burning or loss of skin pigment (hypo-pigmentation). Long pulse Nd:YAG lasers were created to cater to dark-skinned patients, so they are safer on the skin at settings that actually affect the hair than alexandrite and diode lasers.