6 weeks post-op, hole at incision after Breast Augmentation with fluid. Should I be concerned? (photo)

It is so hard to advise just from the picture.  It could simply be a suture spitting out.  I am glad you are seeing your plastic surgeon, good luck.  

It's hard to tell exactly what is going on by your story and picture. Best bet is to have your surgeon examine you and advise accordingly. This may be something superficial or may be deeper heading down toward the implant which could jeopardize the implant.

Thank you for your question and photograph.  Your description and photograph indicate that you may have a "spitting stitch" where a suture or knot of a suture is poking through to the surface.  This is a normal occurrence and very likely to heal just fine.  My advice is to seek the advice of your plastic surgeon to rule out any infection.  Best of luck.