At 6 months after arm liposuction, some firmness, swelling, and sensitivity can still improve, but ongoing pain and a visible difference between the two arms should be assessed in person. In the photos, there appears to be asymmetry and uneven contour around the upper arm/adjacent back area, but photos alone cannot tell whether this is residual swelling, scar tissue, uneven fat removal, skin retraction, or another issue. The most important step is to return to your operating surgeon or see another board-certified plastic surgeon for an exam. They can check for firmness, tenderness, fluid collection, nerve-type pain, skin quality, and whether the contour difference changes when you move your arm. If there is a lump, increasing swelling, redness, warmth, drainage, fever, or worsening pain, you should be seen promptly. If the issue is swelling or scar tissue, time, compression, lymphatic massage, ultrasound therapy, or physical therapy may help, but only under your surgeon's guidance. If there is a true contour irregularity or over-resection, revision options such as fat grafting, limited liposuction, or scar release are usually considered only after the tissues are stable, often closer to 9-12 months or longer. Pain should be evaluated before planning any cosmetic revision.