Hard fall on kneecap?

Hello, I fell off my bike two days ago and landed on my kneecap. At first there was just a bloody wound, but since yesterday I haven't been able to walk properly. * When I want to walk, it hurts when I bend it. I tried bending my knee and could see that my kneecap is normal on the left, but has a bump on the right. What could that be? It's never been there before. Could it be caused by the fall?

{But I must also say that I also went to work with the pain and it was a bit of a burden.}

"I know this is an online platform and not a doctor's office, but does anyone know what this could be? Or what I should do in my situation?…"