Promoted Local Answer
Any time an incision is made in the skin, there will be a scar. At this point in the process, the scar is healing still. It takes a full year for the scar to undergo remodeling. In the meantime, there are scar gels which may help. You may consult with your surgeon in this postoperative period.
Surgery of any kind takes at least 6 months to fully heal. Although I'd have to examine you, firmness and erythema can simply be the ongoing healing process. Its been my experience the the firmness you are experiencing starts to soften at 6 months.. Check with your plastic surgeon to see if you should massage the area on a regular basis to soften up the area.
I hope this was helpful,
Beverly Hills, CA