What causes sore welts behind knees?

What Supplies motor fibers to the muscles of the tongue? Pregnant and have been checked for std's but when i pee it burns is something wrong? What is the result of a dead or weakend germ injected into your body? Pins and needles during second trimester of pregnancy? Can allergies cause swelling under both eyes in the morning that goes away in the afternoon and has lasted for 2.5 weeks? What happens to the pupil when a torch is shined into the eye? Does freezing a wart hurt? Can anyone use contacts? In a 59 year old female what could cause extreme sensitivity and prickly feelings in fingers and hands? How many amputees are in Honduras? What is the major differences between Acute Anemia and Chronic Anemia? Is tribuss not going to work if taken on a full stomach? What is the lungs anatomical position to the skin? Do boys like girls with armpit hair? What substances increase your chance of developing cancer? What age do boys ussaly produce spurm? What does hindering mean? What effects does exercise have on the cardiovascular system? Do lazy eyes go away? 16-8cm of liver is normal?