Hello Good After Noon, This might be seems a fracture of your little finger and first metacarpal bone. According to your history you slammed your right hand down on a table, so there was a strong voluntary force applied, which stroked on very hard surface of the table. So there can be a fracture along with tendon injury and edema, which is causing pain, tenderness and swelling at that site. Fracture needs to be managed by immobilization, like with a POP slab, and if there is any displaced fracture, then surgery may be needed. So now simple steps to be taken: Just go for a x-ray right hand and wrist, nothing serous injury is looking for the arm. Go to orthopedic doctor for further management. Regards, Dr. Naresh Jain.