Use the following natural remedies:
1. Turmeric and milk
Turmeric inhibits the production of melanin and that helps to lighten the skin. Mix turmeric powder with a tablespoon of milk and place it on your lips for five minutes. Then wash it away with cold water.
2. Lemon and sugar
Lemon and sugar can be used to exfoliate the lips. Extract the juice from the lemon and add some sugar to it, rub your lips with it and leave it till the next morning.
3. Coconut Oil
Consistently rub coconut oil on your lips and watch them get lighter.
4. Aloe vera
Aloe vera can brighten the skin and also lighten the lips because it acts as a melanin inhibitor. Apply some to your lips and when it is dried, clean it off with warm water.
You could also add some honey to the mix for a better effect.
Beetroot can give pinker lips. Extract juice from a peeled beetroot. Apply it on your lips and leave it on for 15 minutes before washing it off.
As a bonus, drink a lot of water to keep your lips hydrated.