Contusions (AKA scrapes and bruises) can vary from minor bruises and scrapes to large, painful hematomas. They can be minor or can hide deeper injuries. 
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• What was the mechanism of injury? Did the person trip and scrape a knee? Fall out of a tree? Crash their bike?
• Is the wound dirty? Wash any open wound with clean water and if visible dirt is present, wash while scrubbing with a wash cloth.
• Is there any abdominal pain? If so, there may be internal bleeding and the patient should be monitored closely/checked on frequently, at least for the next few hours.
• Is there any swelling or underlying bone injury?​ If there is significant pain at the site of the injury, especially when bearing weight, consider that there may be a broken bone or at least a sprain.

1. Wash the wound thoroughly, removing as much dirt or debris as possible
2. If the wound is open, apply antibiotic ointment or petroleum jelly/Vaseline to a bandage, then cover the wound with bandage.
3. If there is swelling at the site of the wound apply an elastic compression bandage (like an ACE bandage) if you can.
4. If you have ice, apply an ice pack.
5. Instruct patient to change the bandage daily and watch for any signs of infection: redness, drainage from the wound, fever, increasing pain and swelling.