My Incision is Open? What is the White Area in the Middle? I Am Almost 4wks Post Op. How Can This Be Fixed? (photo)

It appears that you have a superficial wound opening but this condition should not be taken lightly.  The inframammary crease incision is the most common incision used for breast augmentation however it is at the bottom of the breasts and all of the edema fluid will drift to this location.  A scar is actually its weakest point 2 weeks after surgery.   This type of wound separation requires plastic surgical expertise to ensure that the implant does not become exposed.  Once exposed the implant will likely need to be removed.  

You are right in calling your surgeon .This looks like a superficial healing problem but since there is an implant involved, it should get checked out.