Dark, discoloured pigmentation is very stubborn and can take a long time to get under control. It requires a lifelong commitment of diligence to slowly fade dark pigmentation and protect from further damage.
It is imperative to use quality serums that are rich in antioxidants (Vitamin C, Astaxanthin, Resveratrol) that repair skin damage, boost sun defence and help with collagen production.
It is also important to use naturally brightening agents (Azailic acid, Arbutin, Licorice Root). Other effective treatment ingredients to look for are Alpha-hydroxy acids (glycolic acid, lactic acid).