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Finger dislocation, also called a finger jam, is a common injury. It occurs when the bones of the finger are moved (dislocated) from their normal position. A dislocated finger can occur in any of the joints of any finger, but it occurs most often in the middle knuckle of the little, ring, middle, or index finger.
Bruises are observed over dislocated middle of finger (PIP) or near tip of the finger or thumb (DIP) joint. c. Bruising Following Dislocation of Metacarpo-Phalangeal (MP) Joint- Bruises are seen over knuckles or skin in front of MP joint.