Hi! Thanks for your query. Preferably do not leave olive oil overnight on face.
Vitamin E capsule will help if there is dryness or flaking. Sunscreen usage and other pigmentation reducing creams can help to some extent.
Health Tips
Following health feeds should be helpful : "10 Tips for Brighter & Younger Looking Skin!" by Dr. Jolly Shah Kapadia - https://www.practo.com/healthfeed/10-tips-for-brighter-younger-looking-skin-16374/post