Breast reduction wound has split open and keeps splitting more. How do I stop the incision from opening more? (photos)

Sorry to see the issues you are having with your breast reduction surgery.  Having triple point healing issues can happen, but unfortunately yours are a bit larger.  At this point support and taping in addition to close follow up with your surgeon would be best.  Sometimes sutures can be placed at the border as to prevent any further opening of the wound.Hope that helps.

Thank you for your question.
You should see your surgeon . He or she need to take a look at this and decide what care is needed. Best wishes!

Dear Independent1730,
based on your photos, it looks like you have wound separation. This type of wound is not uncommon after breast reduction. It is usually caused by increased tension on incision site and poor blood flow. I would suggest you to consult your plastic surgeon, follow your surgeon's instructions and keep your wound clean and covered. It can take few weeks or months for wound to fully heal. 
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Hi and welcome to our forum!
The operative procedure of breast reduction involves
separation of the skin and soft tissues of the breast from underlying breast
tissue followed by removal of excess skin and breast tissue. The skin and soft tissue is then advanced downward and the excess skin
and soft tissue is removed in an inverted "T" fashion.  
If the closure is tight, if there is blood supply impairment or if there is failure of the suture line, the wound will separate (dehisce). No skin or soft tissue is lost. Wound separation prevents the buildup of underlying pressure which could otherwise jeopardize tissue survival. Blood supply impairment can be due to the effects of smoking, diabetes mellitus, vascular disease, previous surgery in the area (disrupting the normal blood supply), infection, or may totally inapparent.   As swelling decreases, the wound will begin to shrink and eventually close. Frequent local wound management is required. Wounds of this size will usually seal within 2-3 months under direction of your plastic surgeon. 
I am often surprised how well these scars often heal.
Best wishes...