Recently I Have Had Some Swelling In My Legs,but For

recently i have had some swelling in my legs,but for the past two weeks i have not noticed that much swelling. this morning when i woke up my right lower leg hurt slightly i looked to see why,and there was a indentation about the size of an egg.my legs were not swollen at all,in fact they looked smaller than they should have been. can you please help me? what would cause this? thanks snowdy