Is Lipo Cavitation/RF safe for post VSG patients?

I am a VSG patient about 4 years out. I am 24 years old. My surgeon is now retired and I don’t know who to ask. Most of my skin has sprung back into place but my arms are the only place that hasn’t. The saggy skin isn’t major and I was just looking for some tightening of the area. I am looking into lipo cavitation/RF and was wondering if it would be safe to undergo?