Little lump/bump on incision after BA, what is it?

It is likely that a dissolvable suture placed just under the skin is being "spit" out by your body.This occasionally occurs, and is easy to remedy. Please make an appointment with your plastic surgeon to be evaluated.  He/she will likely remove the small suture, and you'll go on to heal up just fine. Thanks for sharing!

Hello, a common cause of a bump along the incision is a suture coming near the surface.  However, you'd need a proper assessment by your surgeon to determine the cause.

The lump seems to be caused by a surfacing suture. Usually the sutures used these days dissolve on their own, however to make sure the suture do not cause any irritation, consult with your surgeon so that he can manage the lump.

Thank you for your question and for sharing your photo. I agree with the other surgeon's answers here. The lump is possibly caused by a melting away stitch underneath the skin. These normally dissolve on their own but sometimes come to the surface and cause some irritation and a lump like is shown here on your photo. I would return to your surgeon as they will have more information about what stitches were used and will also be able to trim the stitch which will resolve the issue.Wishing you all the best with your recovery. 

First of all thank you for the questions and the picture.  Most likely it is a dissolvable suture that is spitting out.  I would suggest making a follow up with your surgeon, they will most likely remove the suture that is spitting out.  Best of Luck. 

Thank you for writing to RealSelf.Most likely cause for the 'bump' is an inner suture which is closer to the skin surface and there is increased reaction around the suture. As the suture becomes absorbed the bump will likely disappear. Please continue regular check ups with your PS to make sure that it is not a troublesome suture which needs to be removed by a minor superficial procedure with local or topical anaesthesia. 

This is probably a stitch abscess or suture granuloma.  It is a foreign body reaction to (likely) absorbable suture material.  The suture typically works its way to the surface, but your surgeon can remove it or revise this portion of the incision if it persists and doesn't surface.
Best wishes!