Take it to the vet.
This can sometimes be caused by a blood clot in which case you should get medical help as soon as possible.
Painful.
Torn legaments
Early disseminated Lyme disease is characterized by ongoing fatigue; arthritis-like pains in the joints; a headache that comes and goes; inflammation of the tendons and their protective sheaths (synovitis)
In a bent form that is not look like your other finger
You definitely could have painful swollen veins in your arm after having your blood drawn many times. This happens frequently.
Go to your local vet.
You may be allergic to the fabric or a brand of detergent you might have used. The socks might just be too tight and stopped your blood from circulating correctly.
swollen lymph node due to infection, usually in the head region.
it could be an infection you should see a doctor.
Go to the hospital!
Painful.