I am 40 days post op brachioplasty. This is a pic of my arm - is this scar normal or hypertrophic? (Photo)

It does look hypertrophic in this photo. Silicone sheeting can work really well on hypertrophic scars, if the scar is unresponsive to that steroid injections may be needed.  I would recommend getting in to your physician and talking about treatment options as there are many. 

Brachioplasty scars tend to look red and raised for a longer period of time when compared to other incisions on the body.  Silicone sheets, kenolog (steroid) injections, and compression garments will help your scar to progress in a favorable manner.  I would advise you to revisit your surgeon.  He/she will advise you on next steps as your scar does appear to be hypertrophic.

Brachioplasty can sometimes result in scars that are wide or thick. Scars take about 12-18 months to significantly mature so that they appear finer and the color fades. At 40 days postop following brachioplasty, you are early in your recover. However, it does appear that you have developed hypertrophic scars. You should follow-up with your surgeon for recommendations about how to treat these scars. Treatment may include scar massage, silicone scar therapy and even corticosteroid injections.