A few weeks ago i dropped serving heavy on my foot. the bruise is gone but a tender bump remains.?

May be a calcium: The bone lives on its outside surface like bark on a tree. If you dropped something on a bony surface, you do not have to break bone to get a reaction. A marred bone may put on a bump called a callas, composed of bone fixers and blood that creates a knot that may last quite a while. Some bruises will also form a pocket of calcium that may last for quite a while also.

Foot pain: Pain is not normal. If you feel it's lingering even if no swelling nor bruising, pain is your indication you need to see a doctor. I'd recommend asking about possible contusion to the location foot. You may need an xray to rule out other pathology. I hope this helps.

Bone: If lump remains it needs to be checked. Possible bone contusion or other bone problem or a soft tissue mass that developed secondary to original injury.