I’m not a doc, but have some knowledge of the mechanics and engineering.
If you type a lot, maybe your bruised one side of the joint via repetitive stress.
Or if your posture isn’t good, your shoulder is tweeked, and the muscles are torquing the joint.
Rest the hand. Take (OTC pain med of choice). Use a topical. Give it two or three days. If the symptoms persist at the same level, see a doc. Right then. If they lessen but don’t go away in 7-10 days, still see a doc.
Thanks for the advice. The main things are:
(1) Massaging forearm relieves some of the pain when clasping
(2) Middle finger hurts when I either grip an item or pull it to the right (left, up and down are okay).
I’ll give it some time (I’ll take some Motrin) and do some massaging. If it doesn’t go away, I’ll see my GP or a specialist (what kind of specialist?).