Question

What is the name of a prominent, rough, bone projection?

Answer 1

A prominent, rough, bone projection is called a bone spur. It may be rough or smooth, but can result in pain in the affected area.

Explanation:

A spur is an extra projection od bone where it is not usually present. It its in response to the body sensing unusual wear on various bony structures. A bone spur may be caused by inflammation due to degenerative diseases, or by injury, due to poorly fitting footwear, for example.

There is more information here:
https://www.medicinenet.com/bone_spurs/article.htm