Skin tightening after surgery gynecomastia surgery? (Photos)

I had gynocomastia surgery and after my skin now sags. How would I make my chest more smooth, flat, and or remove the extra skin. When I flex my chest sinks in. I still have the shape before I had surgery now I wanna remove that.. My doctor recommended 4 skin tighting treatments. But would I need to undergo another operation. I'm also losing more weight How can I correct this?. Any advice or recommendation would be helpful. Thank you.

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