It's important you get this checked with the orthopaedics at your local hospital as soon as possible. There too many parts that make up the hand to get an exact evaluation of your injury. You will first have to determine and try to isolate the sorce of the pain. This may be muscular, related to the tendon or bone. If the sorce of the pain is on your pinky side of the hand this is were you will find the hypothenar muscles. Again it is important to determine if the pain is actually in that muscle, tendons or bone. There twelve tendons in the hand, these extend from larger tendons in the forearms (flexor tendons). You have tendons running over the back of the hand (extensor), because they extend and tendons running along the palm side (flexor), because they flex. Determine if the pain is present when you extend or flex your fingers. The orthopaedic department will be able to x-ray your hand to see if it is bone related.