In the US, for things like passports, retouching is disallowed. However, if the effects are small, they'll have no way of detecting. No one's going to scrutinize your face for all the wrinkles you removed.

I haven't needed to use one of them, but if you look at the pictures on this website (https://travel.e-japanese.jp/japan-id-photo), you'll see that it's possible to select passport pictures and also apply skin correction/lightening to the pictures. I don't know if those options are disabled for official photos though.

There isn't. Japanese photo IDs look just like most other countries IDs (horrible).

There are photo booths for taking "fun" pictures, not IDs pictures.

I'd imagine you would have trouble traveling outside of japan with an obviously retouched passport photo.

There's the classic trick that Penn& Teller wrote about in "Play in Traffic"

https://www.instructables.com/Prank-a-Cop-with-a-Clown-Nose/

> Then, while he is looking at your drivers license, grab the bigger red clown nose from your visor and put it on!

Nice way to get shot.