An intravenous pyelogram may be used to diagnose disorders that affect the urinary tract, such as kidney stones, bladder stones, enlarged prostate, kidney cysts or urinary tract tumors. During an intravenous pyelogram, you'll have an X-ray dye (iodine contrast solution) injected into a vein in your arm. The dye flows into your kidneys, ureters and bladder, outlining each of these structures.
By Mayo Clinic Staff. Here are some of the most common causes of true under-eye circles. 1  Allergies. 2  Atopic dermatitis (eczema) 3  Contact dermatitis. 4  Fatigue.  Heredity â dark under-eye circles can run in families.
Other Causes of Dark Circles. Dark circles under the eyes may be hereditary. Because the skin under the eyes is very thin, when blood passes through the area it can produce a dark color, much like the blue color of your veins. The thinner your skin, the more the circles will be evident. Another cause can be overexposure to the sun. Another much-ignored cause of dark circles is allergies.