The variation of dark patches and other skin discoloration depends on the concentration, density and depth of melanin at different skin layers. Pigment or melanin concentration in the inner layer of the skin can be stubborn and difficult to treat. The melanin absorbs the laser light energy and is broken up into small fragments, which are then removed by the body, rendering them less visible. However, the newest lasers delivฌer energy rapidly with an ultra short pulse of a trillionth of a second or a picosecond pulse. Many dermatologists consider the picosecond laser the most advanced laser treatment for a brighter complexion.

Source: The Nation Bangkok June 13, 2018 18:00 UTC