Lasers work to reduce and remove hyperpigmentation by breaking up the pigment deposit. (This is also why lasers are used to remove tattoos.) Laser removal is very effective and not very painful compared to other treatments.
However, it may take several lasering sessions to achieve your desired results, especially if the affected area is very large or very dark.
Proper after-care is required, as the skin will likely be red and swollen after the treatment. Patients should stay out of the sun, keep the area protected, and avoid picking or irritating the affected area.