The first ones die. Initially white blood cells come to the area and fight the infection as the platelets cause the cut to clot. The red blood cells and white blood cells that are caught in the clot die and form a barrier against infection. Meanwhile underneath the scab, new white blood cells keep it clean and other cells called fibroblasts start building a new skin layer. When you get cuts or spots with a bit of puss in it, that is lots of dead white blood cells that were fighting some bit of dirt or bacteria.