DIP joint pain

Hi Dr 8a :)  After sending a crimpy boulder (nasty 2 finger crimp) my left middlefinger DIP joint is slightly swollen and I have a  slight pain when flexing it hard.  The pain is mostly located on both sides of the DIP-joint.  There is no pain in the "normal range" of motion.  When trying to crimp it is rather painfull on the "inside" , but openhanded I can put 100% load on it.  When I squeeze the joint it is painfull on the red areas on the image, but not on the rest of the joint.  I guess it's back to "rehab" with it, 6 weeks with no crimping, and only jugs/openhanded.  But I'm still windering what kind of injury this is?