Don't get hurt!: A hematoma is a "bruise". Usually caused by injury. To avoid 100% of these, is impossible. We all bang ourselves on something, we have all fallen, etc. You can avoid injuries by caution, seat belts, protective sports gear, good warm-ups before activity, avoiding intoxicants etc. Sometimes unexplained bruising can occur due to medication effects or bleeding disorders. See a doc for this.
Answered 3/21/2019
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