3 weeks post from a lift and the stitch seems to be splitting at the breast fold. Should I be worried it will scar more? (Photo)

Hello,That is more than a spitting stitch, and if you have an implant (it looks like it), then it's at risk. It appears that you have a 'lollypop scar', which can be converted to an anchor to not only cut out the thickened scar that will form, but also improve breast shape after you've healed. Best of luck.

Stitches splitting? I appreciate that you’re sharing just concerned with the rest of us! When healing delays and other complications at the bottom of that breast left incision are not that uncommon. Of course, there is a possibility that I won’t delay can lead to a worse scar. But I also find that appropriate and timely care, which could possibly include antibiotics, and dressing changes can lead to a very acceptable and nice result. I strongly suggest that you notify your plastic surgeon and use your plastic surgeon as a resource to help you to heal better. In some cases, vitamins a, B, C, D, and zinc can help in this stage of the game to achieve a better result. Occasionally, patients also tend to benefit from adding fish oil and a high protein diet to the regiment. Always discuss these options with your plastic surgeon before starting any new supplements.

Dear Mommybusiness415,this type of wound is not uncommon after breast lift. It is usually caused by 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

It looks like you have dehiscence of the incision.  The tissue underneath looks healthy and I don't see signs of infection.  This type of wound should heal on it's own, but it will leave a larger scar.  I would be concerned, however, if you have an implant as it could be at risk depending on the quality of your tissues.  

You have some delayed healing and separation of your wound edges at the bottom.  If the separation is just superficial and you have healthy tissue underneath, these areas are capable of healing on their own with wound care over time.  It would be best to see your surgeon for an assessment of the area to find out if this is your case.  If the separation is not just superficial and extends deep to your implant pocket, then there is a threat of an implant infection.
In terms of scarring, areas that have separated tend to scar more than areas that have not, but fortunately it has occurred at the bottom of the breast, an area that is often not noticeable once you have fully healed.  In addition, it appears as though you have a vertical/lollipop scar, in which the excess vertical skin of your breast has been gathered, rather than directly excised.  If you are unhappy with the healing or scar at the bottom of your breast, you can always convert to a small anchor scar, which can remove the scar and excess skin directly, improving your breast shape at the same time.
I hope this helps.

Thank you for your question. This happens all the time with this type of surgery - try and follow the recommendations of your Plastic Surgeon and go from there. Chances are you will eventually heal up just fine, and the scars will likely contract to the point that they will not be very visible. Best of luck!