Thank you for the query.
Most likely you have your tendons strained. It is very hard to tell which exactly not being able to examine you. Some of such strained tendons does not need medical attention. However in some cases even splint
is necessary. Bones fractures
should be also ruled out.
That is why I suggest you to have injured area X-ray performed and visit orthopedist. Physical examination should be performed and will tell either it is something serious or not.
Hope this will help.