Pain in the lower back and hip radiating down the back of the thigh into the leg, initially attributed to sciatic nerve dysfunction (hence the term), but now known to usually be due to herniated lumbar disc compromising the L5 or S1 root.See: sciatic. (Contugno), Domenico Felice Antonio, Italian anatomist, 1736-1822.ain in the lower back and hip radiating down the back of the thigh into the leg, initially attributed to sciatic nerve dysfunction (hence the term), but now known to usually be due to herniated lumbar disc compromising the L5 or S1 root. See: sciatic. (Contugno), Domenico Felice Antonio, Italian anatomist, 1736-1822.
Dark spots are the result of the overproduction of melanin (skin pigment). It's not fully understood why dark spots develop, but aging and UV light exposureâeven exposure to artificial UV light, like the kind used in tanning bedsâare major causes. Dark spots can develop anywhere, but they are most likely to appear on the parts of the body that receive the most sun exposure, including: 1  The face. 2  The backs of the hands. 3  The shoulders. 4  The arms. 5  The back.
Experts say that having dark spots, specifically around the eye area, is one of the telltale signs of skin aging, apart from wrinkles and gray hair. It is no surprise that a lot of people, especially women panic a little bit at the first signs of dark spots around the eyes. What are the Diseases and Medications That Cause Dark Spots? Dark spots can be caused by a number of things. Certain lifestyle choices such as oneâs diet, sleeping patterns and exposure to smoke and pollution contribute to skin imperfections, including dark spots. However, there are certain diseases and medications that do cause dark spots. Post-inflammatory hyperpigmentation is a common cause of dark circles due to acne and allergies. Other diseases that could cause dark spots are the following: melasma and Riehlâs melanosis.