My son is 5 years old. he has a increased bone above the back side of ankle on right foot. he don't have any pain. is it normal.

Bone: The very best thing to do is see your podiatrist for an evaluation and x rays . Without the patient before any of us this is very difficult to make a comment about

Unclear: It's hard to give a helpful answer without more information. It would be reasonable to have him evaluated by a podiatrist and x-rays taken to assess the area. Children seldom have pain as a primary symptom.