1. Lack of sleep: Lack of sleep or poor sleep quality can lead to dull complexion.
2. Bad eating habits: Bad eating habits will reduce the body's metabolism and lead to dull skin.
3. Lack of moisture: The skin needs enough moisture to keep healthy and shiny. Lack of water can lead to dull complexion, fine lines and other problems.
4. Sunburn: Ultraviolet rays in the sun can cause skin damage and make the skin dull.
5. Air pollution: pollutants and toxins in the air can damage skin cells, leading to dull skin.
6. Stress and tension: Stress and tension can also darken the skin.