Lips get dark due to various reason that is use of some cheap brand of lipstick, sun exposure, heavy application of lipstick, drinking tea or coffee in excess.

The most important cause of dark lips is smoking.

It can also be due to allergy and dryness.

Vitamins, iron and fresh air keeps the lips red.

Carrot and orange juice should be taken for maintaining red lips.

Tips for maintaining red lips:

• Before going to bed massage your lips with drops of glycerine, lime juice and honey.
• Lemon is natural bleach apply it with a little glycerine at night.
• Almond oil is good for discoloration of skin. It can be used any where in the body.

Source: Fashionpk.net