Hi. Repetitive strain on middle and ring fingers may suggest fracture or a swollen tendon sheath (e.g. trigger finger). Do you experience locking, snapping, popping or catching sensation in the finger while making a fist? Warm and cold compress, rest and pain relievers may help, but it is best that you see your physician right away for assessment. Hope this helps.
possibly a fracture...one that involved the interphalangeal joint (knuckle). I would recommend xrays to aid in diagnosis. If it is non-displaced, rest, anti-inflammatories, splinting would help. Intra-articular fractures ( in the joint fractures) that are displaced, if left untreated, can lead to early arthritic changes. Strongly recommend orthopaedic evaluation....!