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.
Dark Under-Eye Circles. How and why your body creates dark under-eye circles. Most people think that dark under-eye circles are caused by staying up late watching monster movies, or having that last drink the night before, or sitting up with your laptop trying to finish the quarterly report.