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  1. Copilot Answer
    bruise on thigh
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    A hematoma is a bad bruise that occurs when an injury causes blood to collect and pool under the skin. It can cause bruising, swelling, and a lump on the leg. Hematomas are the result of a traumatic injury to your skin or the tissues underneath your skin. They usually are not a cause for concern and can often be treated at home with rest and a cold compress.