Why would you allow others to think that?My main concern is what will people think?
I would feel ashamed if people though I was using 3rd party apps to make my face look buttery smooth.
I’d be horrified if people thought that about me
You could proactively tell anyone who cares that you "use a special app to make my face look buttery smooth"
Let them guess what you use for that.
That assumes that anyone else would notice, or even care about that...
It's a selfie, you know. No one cares about selfies other than their own.