When you cut your hand or scrape your knee, it usually will stop bleeding on its
own. That's because blood is usually able to form clots that protect you from bleeding
But people with hemophilia have blood that doesn't clot
the way it should. That means that they bruise and bleed easily and they may bleed
a lot or for a long time after an injury. Hemophilia is a genetic
condition (meaning it runs in families).