Hypertrichosis is a big word that means having too much hair on your body. You know how some people have hair on their arms and legs? Well, some people with hypertrichosis have hair growing all over their body, even on their face and back!
It's kind of like when a plant gets too much water and grows really big and out of control. In the same way, people with hypertrichosis have hair that grows too much and can't be stopped.
But don't worry - having hypertrichosis doesn't hurt or make you sick. It just means you might look a little different than other people. Everyone is unique, and that's what makes us special!