If your child has a bruise, then blood vessels under the skin have broken. This could indicate a greater problem, such as a fracture or other internal injury.
To prevent bruises, don’t hike under areas where rocks or tree limbs might fall, and avoid falling yourself.
If you have a bruise, the skin of the affected area will be black and blue, tender, swollen and painful. Reduce swelling by applying a breakable ice pack to the affected area for at least five minutes. Then elevate the bruised area to reduce blood flow to it. If the bruise is extremely large or deep, turn back for the vehicle and get medical attention.
Related articles:
g How to prevent and treat hypothermia in children
g Avoiding and treating child dehydration on the trail
g How to avoid and treat nosebleeds
g How to avoid and treat hiking kids' muscle cramps
Read more about day hiking with children in my guidebook Hikes with Tykes.