Even using low quality cosmetics which are filled with harmful chemicals can darken the lips.
There is no need to go for expensive products, If you want to get rid of dark lips. Just follow below given natural treatment:
Take some lemon juice in a cup. Now take some crystal sugar and sprinkle it in the lemon juice. Don’t let the sugar dissolve in the juice. Take this mix and gently scrub it on your lips. Also, apply some lemon juice on your lips before going to sleep every night. It will only take 10 minutes every day.
Repeat this for 5 to 6 days and you will get baby-soft pink lips.