There are multiple causes for facial hyperpigmentation. Sun tan, overweight, pigmentation disorders like acanthosis nigricans or melasma, lichen planus pigmentosus, rhiel's melasnosis, nutritional deficiency etc are some conditions. The patches of pigmentation need to be examined and assessed to know the cause. Treating it without knowing the underlying cause will offer incomplete and temporary relief; also it will keep rebounding. Get an online consult privately with pictures or meet a dermatologist directly for a proper evaluation of the condition. Hope this was helpful.

There are various treatment for pigmentation. From creams containing hydroquinone to milder ones of Kojic acid, niacinamide, arbutin. There is options of glutathione injections to oral tablets with vitamin C, also laser toning also gives good results. But what you need to understand us nothing is permanent and you will need to maintain with continuous usage and also protect from sun damage.