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You need to avoid sun exposure. Apply sunscreen SPF 25 for protection from UV rays damage on skin which can make dark skin. Eat plenty of fresh fruits and green leafy vegetables. Drink plenty of water. If there is localised pigmentation of the face then certain skin bleaching agents like hydroquinone
cream may help. Chemical peel may also help to remove dark patches and spots on face. Consult Dermatologist
for effective treatment in your case.