I'm 15 days post-op from a brachioplasty. I'm experiencing "deep" numbness in the lower part of my left forearm.

Thank you for your question.You are very early in the healing process. It is very common for there to be numbness after surgery, due to disruption in the sensory nerves during surgery.  As you continue to heal the numbness should start to resolve for you. It can take 6 months sometimes longer for the sensory nerves to go back to normal. Good luck with healing.

Have you seen your operative surgeon for this issue? If yes, what did he/she say? Could be swelling or at worst a nerve compression. But only in person examinations allow a dx to be made.

Two weeks is still very early in the recovery period. It is common to have numbness in the upper part of the arm after brachioplasty. This can sometimes last for several weeks even a few months but almost always fully resolves. Numbness in the forearm is less common but still occurs. It is often due to the temporary trauma and swelling from the surgery but can also be due to discrete fluid collections (hematoma, seromas and lymphoceles) pushing on tissue. It may also be due to any compression garment you may be wearing. Please follow up with your surgeon to make sure this isn't the case. Aloha,Dr C