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See here, firstly you need to take precaution. Avoid sun exposure as it will make the rash worse. You can use susnscreen SPF30 for preventing UV induced damage. Avoid any cosmetic use. Eat plenty of fresh fruits and green leafy vegetables. Drink plenty of water. Use creams of hydroquinone
, azelaic acid to remove melasma patches after Dermatologist
advises. If you follow the advise carefully it should go away in few weeks. Also chemical peels
will help improve the condition. Laser therapy
is available for dark patches which are refractory to other treatment.