Wound healing takes time
It takes 6 to 12 months for the redness to mature and become normal cooler in most wounds. Give it time, it is normal for a wound to be red for quite an extensive period of time. Good luck...
Thank you for your question. The scar usually takes about a year to mature. If you are are Asian, or Latino, the scar may take up to 2 years to mature. I recommend using a scar reduction regiment for a minimum of 3-6 months for best result. The fluctuations that you see is a normal part of healing and recovery. Best of luck with your recovery.
What you are describing sounds like normal healing. It usually takes 6-12 months for a scar to fully mature. Cause for concern would be redness accompanied by drainage, fever, chills, nausea/vomiting, or if the breast was warm to the touch. As with any situation if you are concerned contact your board certified plastic surgeon.