How do you know you have it ?
It is an injury where there is an external or internal rupture of a tissue of the body, generally the skin.
What to do at home?
Take a pain medicine if the cut hurts a lot. Put iodine (a liquid that helps stop infection) on the wound twice a day.
Make sure that the wound is kept clean and dry. When you take a shower you have to be sure not to get the wound wet. When the cut heals, don't scratch it and try to keep it out of the sun because otherwise it will leave a permanent scar.
And remember, always ask your doctor!