Why do I have a bump 4 mos. post op tummy tuck? (photos)

Hello. Great question. Thank you for your pictures. You are still early in your recovery, swelling may still be present. I will suggest having an in person follow up with your surgeon to determine exactly the condition of your bulge. Best of luck with your recovery. Congratulations on your tummy tuck.

You are still in the recovery period from surgery and swelling is common at this phase.  I recommend discussing your concerns with your surgeon who can examine you to rule out complications.  As you notice an improvement with your binder, it is likely normal swelling from increased activity.

Hello dear!!
Thanks for the question and provided information as well.
You are still early on the healing process, it can take up to six months to see your final results, so please be patient. At the stage you are in, inflammation is normal. 
If you are not happy with the results then, l recommend you to make an in-person consultation with a board certified plastic surgeon for a proper answer and to talk about your goals and anything you need to know.
Good luck :)