Thanks for writing to us.
The lump on your shin is not likely to be asociated with the acciedent you had 5 years ago. From your descrition, it seems to be due to a hematoma
or a stress fracture
. You need investigations like X-ry and MRI
of the affected area to find out the cause. Consulting an orthopedician will be helpful.
I hope this information has been both informative and helpful for you.
Dr. Rakhi Tayal