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I have read your question and understood your concern. Melasma can relapse. Therefore, you must continue with a maintenance regime once your melasma clears. I suggest you to use a higher SPF sunscreen like Sebamed sunscreen like Sebamed sunscreen SPF 50+. In addition I would suggest you to use Aziderm 20% gel (Azelaic acid) twice daily for dark spots. In morning use Aziderm after washing face and after 30 minutes, apply sunscreen over it. At night apply Aziderm and leave it overnight. Aziderm is slower acting, but it is safe. It can also be used for maintenance therapy. Melalite (Hydroquinone) and Lookbrite (combination of Hydroquinone, Tretinoin and Mometasone furoate) are steroid based creams and cannot be used for more than a month as they can have side effects.