One month post-op, my incision is getting bigger, is this a concern? (Photo)

Hi
Thank you for her sending your question and photos. I’m sorry to hear that you’re struggling with your scar. Them photos shows the evidence of small wound break down at the T-junction. This area is considered to be the weakest part of the scar in abreast reduction surgery. It should heal on its own within the coming few weeks however the quality of the scar in this area won’t be predictable.

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. Excess breast tissue is removed.  The skin and soft tissue are then advanced downward and the excess skin
and soft tissue is removed in an inverted "T" fashion.  
If there is impairment of the blood supply to the breast skin and
soft tissue, the segment of the flap the greatest distance from its blood
supply may not survive (at the junction of the inverted "T" flaps).
The cause of the blood supply impairment can range from effects
of smoking, diabetes mellitus, vascular disease, previous surgery in the
area (disrupting the normal blood supply), infection, or may totally
inapparent.  
Treatment consists of removal of the unhealthy tissue, followed by
intensive wound care. One looks for the development of granulation tissue, a
beefy red vascular tissue, to develop, after which time the wound will begin to
shrink. Most wounds of this size will seal over a span of 8-12 weeks.
However, a regimen of frequent wound care is required after unhealthy
tissue is removed. 
Undergo in-person evaluation by your plastic surgeon and follow instructions given. Scar revision can be considered at one year, but I am often surprised how well these wounds often heal on their own.
Best wishes...