Could This Be a Case of Shingles Post Breast Reduction? (photo)

This is NOT shingles! It is a wound dehiscence from the vertical incision being closed under tension. Thus you have the wound split open and skin necrosis. Best treatment is local aggressive wound care, PRP therapy, IPL-red light laser. In time this will heal by secondary contraction and re epithialization. As the scar matures over 6 months than you could consider a scar revision. Are you sure your chosen surgeon is a boarded PS??? PM any of us expert posters the surgeon's name so we can help you. 

This is certainly not a case of shingles.  It is a problem with compromise of the blood supply to the skin flaps.  There are several causes for this problem.  It is more frequent in patients who are smokers.  At this point all that can be done is conservative wound management.   Once the area has healed the scar can be revised.  Stay in close contact with your plastic surgeon.  

Sorry about your wound problems. You do not have shingles. From your photo, it appears that you are having issues with skin necrosis. The skin is not there because it "died" due to lack of blood flow. Valtrex will not heal your wounds... Thank you for sharing your photo and concerns. Best wishes.