If your black lips have been caused by drinking too much tea, coffee or by smoking, you will need to cut it down before your lips can lighten (2 Cups of coffee or tea doesnt matter). Apply Vaseline to your lips regularly. Ghee is also very good, apply a little ghee every night. This keeps lips moisturised. You could also apply lemon juice to your lips daily, to lighten them slightly. Wear lipstick with sunscreen, as uv radiation may cause pigmentation.