Hello. A dislocated finger, even one that went back into place, needs to be checked by a doctor. I would advise you to go to your local urgent care or ER and get this checked. The swelling should be treated with ice and the finger will need to be splinted. Here's a link where you can read about finger dislocation
http://www.emedicinehealth.com/finger_dislocation/page7_em.htm
On the right side of the page there are other links you can click on to learn more.
I would see a doc because you only get one chance for this to heal correctly and the doc can also give you meds to reduce swelling and heal it faster.
If you need more info., let me know.
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