Detailed answer

When the skin lacks sufficient moisture, it can become dry and dehydrated. This can lead to a dull and lackluster complexion. The outermost layer of the skin, known as the stratum corneum, acts as a barrier to protect the skin from external elements. When it lacks moisture, it can become rough and flaky, causing light to scatter rather than reflect evenly on the skin's surface. This results in a dull appearance. Additionally, dry skin can hinder the natural exfoliation process, leading to a buildup of dead skin cells, which further contributes to dullness. Therefore, maintaining proper skin hydration is crucial for achieving a vibrant and radiant complexion.