I'm curious about information on getting rid of a double chin.

I'm curious about getting rid of a double chin.
In the past, I thought that a double chin was something that actually happened when you gained weight.
But I think there were a lot of people who weren't like that.
When I was young, most of the kids who were a bit chubby or fat, or had thick faces, naturally had double chins, so I just thought it was the effect of fat.
But as I got older, I noticed that even people who didn't gain much weight had double chins.
There seems to be a limit to what you can do with exercises or anything like that to get rid of a double chin.
So I think the power of the procedure may be needed.
I looked for some information about getting rid of a double chin, but I couldn't find anything that was particularly detailed.
I don't know if that's possible with dermatological procedures.
I feel like I need to at least fill in some fat or cut it out to get rid of my double chin.
I'm curious as to how this is possible and what procedures or methods are used.