Cant bend fingers after trauma

[minimc]

Hey there,

4 months back a heavy (15kg) item fell on my hand. Pain swollen as usual but no bones broken no nothing.
I've been wearing a splint for a month. Still cant bend fingers. Just half way.
At touch you can feel kind of bumps on the palm side where finger joints are.

Any idea if this goes by itself in time or needs some sort of medical intervention or physiotherapy ?

Thanks