All open wounds heal in the same way. First, new red tissue builds up from the bottom and then new skin grows in from the edges and covers the red tissue. Your wound will heal fastest if you create the best conditions for new tissue to grow. Keep your wound: clean, warm & moist.
If your wound is not progressing towards healing it may be for several reasons. First, it may have to do with an underlying condition that is not properly controlled, for example use of proper compression for venous insufficiency, or glucose control in diabetes. Another reason why your wound is not healing may be because it has become infected.