Detailed answer

Mineral sunscreens, specifically those containing zinc oxide or titanium dioxide, are the best options for melasma. These ingredients provide broad-spectrum protection from both UVA and UVB rays. Look for sunscreens with an SPF 30 or higher to ensure adequate protection. Avoid sunscreens with chemical filters like oxybenzone or avobenzone, as they can trigger melasma flare-ups in some individuals. Additionally, consider sunscreens that are labeled as 'non-comedogenic' or 'oil-free' to prevent clogging of pores and potential aggravation of melasma. Remember to reapply sunscreen every 2 hours, especially when exposed to direct sunlight, and combine it with other sun protection measures like seeking shade and wearing protective clothing.