Photoprotection is a key component of melasma and hyperpigmentation management; however, labeled SPF may not reflect the protection achieved in routine practice. Underapplication, incomplete coverage, product rub-off, and failure to reapply can reduce delivered protection, allowing repeated UV, UVA1, and visible-light exposure to sustain melanocyte activation despite ongoing topical therapy. The resulting protection gap may contribute to slower treatment response, recurrence, persistent post-inflammatory hyperpigmentation (PIH), and lower patient satisfaction. Correct sunscreen use requires sufficient quantity, uniform coverage, application before daylight exposure, and repeated application during continued exposure. Assessing sunscreen-use behaviors is therefore essential for optimizing durable photoprotection and clinical outcomes.^[1][2]