Melasma and hyperpigmentation can be really stubborn to treat, and you're right that some treatments can potentially make it worse if not done properly, especially on darker skin tones. The fact that your dermatologist recommended sunscreen is actually crucial - sun exposure is one of the main triggers that makes hyperpigmentation worse, so religious sunscreen use is essential even if you're getting professional treatments. That said, there are definitely treatments beyond just topical creams that can help. Chemical peels with ingredients like glycolic acid, lactic acid, or kojic acid can help fade dark spots by exfoliating the pigmented skin cells. Laser treatments like IPL or certain fractional lasers can also be effective, but they need to be performed by someone experienced because the wrong settings can cause post-inflammatory hyperpigmentation. Prescription treatments like hydroquinone or tretinoin are often used in combination with in-office procedures for better results. The key is usually a multi-faceted approach rather than relying on just one treatment. Have you looked into consulting with a medical aesthetician or med spa that specializes in treating pigmentation issues? Sometimes they have more treatment options and expertise in this specific area compared to general dermatology offices.