What can I do to minimize the appearance of cellulite and excess skin in the under arm area? (photo)

An in person evaluation is needed for the best recommendation, but the suggestion by the surgeon you saw seems reasonable. The incision would be limited to the underarm area. The excess skin would be removed, revealing a smoother contour. You may be a candidate for BodyTite which could potentially help as an alternative.

Thank you for your question on managing cellulite and excess skin in the upper arms. After reviewing your history and images, here's my recommendation:

Your concerns encompass mild excess arm skin, arm cellulite, and excess arm fat. While liposuction can address fat, age 50 may impact skin contraction due to collagen and elastin loss.
Considering this, a torsoplasty procedure seems more suitable. This involves an armpit-to-chest incision, effectively removing excess skin and fat in the axillary region. For optimal results, a vertical incision from the armpit down the chest is advisable—a technique known as vertical torsoplasty.
For personalized guidance, consulting with a qualified plastic surgeon is recommended.
Best regards,
Dr. Katzen

I would suggest minimally invasive skin tightening with Renuvion with noninvasive Morpheus. I don't think you would like the long scar.