How is gynecomastia treated in men?

I want to know because there is someone in my family who has gained weight.

How is treatment for men with a relaxed or leisurely lifestyle conducted?

Do you perform a resection surgery? I have never thought deeply about this, so I have no knowledge at all.

I wonder if there is anyone who has tried it themselves.

I'm starting to worry that male gynecomastia might become a teasing point during school days.

I'm also curious about the cost and whether there are any scars.