Open wound in tummy tuck incision. What kind of treatment? (Photo)

Yes close follow up with your surgeon is indicated. Also daily aggressive local wound irrigations and washings are best. This will close in a few weeks... 

I am sorry to hear about the complication you are experiencing.  Superficial separation of the incision line is a known complication after tummy tuck surgery.   Close follow up with your plastic surgeon will be in your best interests; sometimes removal of a exposed suture and/or removal of any unhealthy tissue will expedite healing. Otherwise, wound care regimens will differ from one plastic surgeon to another.  Generally, this will involve application of some type of sterile dressing ( in my practice I use a non-stick dressing covered by a sterile dressing). You should have peace of mind that these types of wound healing problems generally go on to heal over the course of the next several weeks,  without long-term sequelae. Also important to concentrate on a healthy diet,  including good protein source. Occasionally, in the event of a wider scar, scar revision surgery may be helpful down the line.  Best wishes. 

Thank you for your pictures.  Your wound separation is best treated by removing the extruding stitches and local wound care with medicated gauze.  Earl Stephenson, Jr, MD, DDS, FACS