Your skin has a natural renewal cycle of 28 days, from the “birth” of new skin cells to their “death”. Healthy skin will naturally lighten dark spots over time, expelling excess melanin regularly and evenly across the face. Skin brightening ingredients like vitamin B3 will help skin along in this cycle. However, when skin has weakened due to damage from external aggressors, like UV rays and pollution, the skin must work extra hard to expel those spots. Skin that refuses to rid itself of dark spots after six months, even with the help of scientifically-proven brightening skincare, requires expert treatment.