I think you are getting some really good advice on resting for a week and realizing these impact actions (whether its a bag or the green proper) expose you to some pressure on the tnedons and ligiments of your phalanges (ok their just fingers). I don't have a bag but I do use the interlocking grip and I don't play often. I will often feel some tenderness from the position if it has been a long time since I held a club and especially if I have consecutive days or back to back games on the same day. I think the bag would give you significant exposure to strain that pinky with the index finger of the opposite hand either by the tinest pull at impact or even the added pressure that is caused in the impact. It will likely be an inperceptable amount of strain. This would explain why taking your pinky out (especially now while it is in trauma) alleviates the symptom.
I would follow the advice to rest for a few days. Use some arnica cream (a natural anti-inflammatory) and some ice several times a day to get past the trauma. Get a gell ball (get one shaped like an egg) and hold it with the middle, ring and pinky of your hand (go ahead and do them both) squeezing the ball will help move blood into the injured area and speed healing. This will also strengthen the muscles and thereby the pliabaility of your connective tissue. It will just make the pinky hardier to take the assault.
Give it a try and let me know how it goes. There could be numerous answers. Don't try to do too many changes at once or you won't find the origin of your problem.
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