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

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.