Hydroquinone can be used for pigmentation.... however you need to understand that if it is not correctly used- use of hydroquinone itself can result in a pigmentation condition called as exogenous ochronosis. 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 or meet a dermatologist directly for a proper evaluation of the condition. Hope this was helpful.