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
The swollen leg and a rash maybe a sign of cellulitis. Gram staining should be done and antibiotics will be given.
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)
The appearance of painful and swollen lymph nodes is another reason for consulting a doctor.
In a bent form that is not look like your other finger
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.
Go to your local vet.
You definitely could have painful swollen veins in your arm after having your blood drawn many times. This happens frequently.
swollen lymph node due to infection, usually in the head region.
swollen just above elbow and painful. developed overnight