Hi! Thank you for your question and welcome to our site.
Yes, a gross deformity
that is very much noticeable compared to your other hand suggests that you may have dislocated or even fractured one of your wrist or forearm bones.
I suggest that you consult an orthopedist immediately so that this could be corrected as soon as possible so that no long-term functional loss or deformity will occur.
I wish you the best!