What is a ischial bruise?

Why making of antiviral medicine is harden than the antibacterial medicine? What are two characteristics of compact bone? How do you know the STD is gone? Which part produce urine? Why do you have knots in your back? Is the extra copy of Chromosome 21 that causes Down syndrome dominant or recessive? What if one want to HPV vaccine after age 40? When does bones give birth? Could you be pregnant or not I'm 9 days late on cycle I've nausea and sleepy. I've also thrown up about 3 times.? Will coconut help with hair loss? How do the circulatory muscular and skeletal systems work together? Your skin bleeds when you cut it but why doesn't your hair? Can mutagenic agents cause cancer? My boyfriend grinds his teeth at night. I know that the night guards help out with it a lot. but i just dont think he'd be willing to use one. Any suggestions from anyone please? What effects did their increased global trade have on the economic development of Spain and Portugal? What does renal mean? How do the kidneys keep us alive? Does the Integumentary system excrete waste? Why does my eyelid eczema have pus coming out of it? What is tb and what makes it so dangerous?