The term "dead surface skin cells" refers to the outermost layer of dead cells that make up our skin. These cells are constantly being shed and replaced by new ones, which is a natural process that helps keep our skin healthy and protected. However, as we age or if our skin is exposed to harsh environmental factors such as sun damage, pollution, or excessive dryness, the rate of cell turnover can slow down, leading to an accumulation of dead surface cells on the skin's surface. This buildup can cause the skin to appear dull, lifeless and may contribute to other skin concerns such as congestion, breakouts or fine lines.