The discoloration (bruises?) occurred before his blood sugar was in control and the swelling has happened about a year later. Does the swelling generally accompany the discoloration?
Swelling (fluid retention or edema) of the feet and ankles is not directly related to diabetes, although it might be related to some diabetes complications (heart and kidneys come to mind). Discoloration/bruises are hard to explain as related to the swelling and should be diagnosed in person by your husband's physician.
William W. Quick, MD, FACP, FACE