Can you still move your toes?
Is the lump hot?
There’s a number of possibilities but, without medical history and an understanding of what can/can’t move, it’s not easy to guess.
Possibilities include a cyst, broken bone, dislocated bone or a bite or something that’s become infected.
Either way, I’d suggest getting it seen at your local minor injuries unit, it needs to be seen by a doctor.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark