When melanocytes (melanin-producing cells) become hyperactive, they create patches of darker skin that can be difficult to fade with topical treatments alone
You have options, and the best choice depends on your goals
Prescriptions and a medical evaluation are required for certain products
Here are three examples: Exposure to gadolinium in contrast agents increases oxidative stress
Am J Trop Med Hyg 92(1):2227 Esperanza Espino F, Bibit JA, Beulah Sornillo J, Tan A, von Seidlein L, Ley B (2016) Comparison of three screening test kits for G6PD enzyme deficiency: implications for its use in the radical cure of vivax malaria in remote and resource-poor areas in the Philippines
Always consult published literature for detailed study methodologies and findings