Hello, welcome to HCM. There occurs constant production of melanin
in human body which is accelerated on exposure to sunlight. The cosmetic products act by reducing melanin production. They are usually effective only till you keep applying them. You must avoid going into direct sunlight. Use a sunscreen lotion every time you go out in sunlight. Use good quality facewash twice a day and avoid using harsh soaps on your face. Eat plenty of fresh fruits and vegetables green leafy vegetables. Wish you good health.