This is the body's way of healing itself. The liquid under your skin protects the broken bone from further injury. But, your cast may also develop cracks on its own. This happens if it has been hit or crushed. Or it may have a weak spot. Your skin may swell underneath, too. If the doctor did not make a cut on the outside, the swelling may crack it. If you see a new crack, tell someone right away. You may have to see your doctor.
Fourth, watch your skin color around the cast. You may see your fingers or toes turning purple or blue. That means the cast is too tight. You aren't getting enough blood to those areas. Be sure to tell a parent right away. Your doctor will need to loosen the cast so you don't hurt the area more.
