An old device called Volvelles was first used in the 14th century to calculate and record almost everything has been resurrected in the form of wheel charts. These consist of two or more round disks linked at the center with a hole.
Rotate these disks and voila, the user gets instant information. In this modern age where large amounts of information are available on line, the users actually love these because they are easy to use. The wheel chart has made it possible for diabetics to keep track of the sites of their injection of the insulin.
Rotating the insulin injection site will reduce soreness and infection and avoid scar tissue from developing due to overuse. Sometimes this results in incorrect insulin injection. ADA also advised diabetics not to do their blood testing in the same finger each time.
The Anthony & Associates' EZ Site Tracker is compact. It is only 3.5" in diameter and so fits inside testing kits. It is made of 24 pt covered and toughened paper board with a nickel-plated metal hole center around which two outside discs spin. You can choose 20 glucose testing locations for side 1 and 20 insulin injection sites in Side 2.
Injection site rotation is really the way to go. The usual recommendation for injecting the insulin is in the abdomen although other sites can be used too. The important thing is to inject into a site where there is fat. Usually though people find it easier to inject into the abdomen rather than the thigh. There is more information on insulin therapy.
Whatever is the choice for the injection site, remember to rotate the site in the same area rather than doing the rotation in different areas of the body. Why? The reason is to prevent developing problems in the skin and under it. You know what some people do? They do their morning injection in one site, say the abdomen for example and the evening on the thigh.