Lips are one of the most delicate parts of our body. They are constantly exposed to environmental factors such as the sun, wind, and cold, which can lead to dryness, chapping, and even discoloration. A good lip balm acts as a protective barrier, locking in moisture and providing essential nutrients to keep your lips soft, smooth, and healthy.Understanding Dark Lips » : Causes and Treatments. Dark lips can result from various factors, including sun exposure, smoking, dehydration, or even genetic predisposition. If you're dealing with this issue, choosing the right lip balm for dark lips is essential.