A black eye is a type of bruise resulting from direct trauma to the face. Most black eyes are not serious and will resolve on their own, but not always. A black eye could signify a more significant injury, like an internal injury to the eye, a fracture around the eye, or a skull fracture.
If the problem is more serious, the person will experience other symptoms, such as double vision, bruising around both eyes, and nose bleeds, and should see a doctor immediately.

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