Pigmentation refers to colouring. Skin pigmentation is a prevalent problem amongst both males & females wherein the skin becomes darker often in patches leading to an uneven skin tone. The main cause behind skin pigmentation or dark patches is the overproduction of a brown pigment called melanin.
In this article, Dr. Nivedita Dadu is talking about some tips and home remedies to get rid of pigmentation.

Ref: india.com