Hello, thank you for your question.
The bump may have lead to mild injury to tibial tubeosity/tibial shin with some soft tissue trauma.
It will take around 3 to 4 weeks to completely heal.
If pain is severe, you need to get x rays or even MRI if knee is swollen.
Next Steps
Take rest, continue with ice fomentation and take some antiinflammatory medications.
Health Tips
For further discussion, you can take teleconsultation.