Greetings. 1. Avoid using cosmetics, facial, spa, scrubs 2. Diet rich in vitamin c and vitamin A will b helpful like lemon, amla, almonds, green vegetables etc. 3. Strict sunprotection . Use good sunscreen regularly . 4. Drink atleast 2-3 litre of water daily . Kindly share your photographs, so that we can help you out better. Diagnosis and finding reason behind your pigmentation is very important for appropriate treatment .

Pigmentation is a very wide term with so many reasons behind it. It's important to see you along with proper history to reach some conclusion about cause and medications. Still do use sunscreen everyday every 2hourly and take vitamin.