Dull skin refers to a lack of lustre complexion that lacks radiance and appears tired or uneven. It’s often caused by factors like dehydration, dead skin cell buildup, poor circulation, or inadequate skin care. To treat dull skin, focus on exfoliation to remove dead cells, hydration through moisturizers and drinking water, and incorporating vitamin C or other brightening ingredients into your skincare routine. Regular exercise and a balanced diet can also improve the skin’s overall health and appearance.