Hey friends here is an update... looks like this pipe was a really good dust catcher
My wife was telling me right from the start that it's not a mold and that it was dust lol but I was like nah can't be it... so while we were cleaning our appartment I saw a lot of dust on the books.... so she just put vacuum cleaner close to the pipe and basically vacuumed it clean lol.. and pipe is clean and normal inside
IDK what was the white mark on the pipe but it was cleaned super easy with finger so I guess it was just a stain from something. I'll still clean it before smoking it, but think this was just a false alarm.
Tbh it was weird to have mold in my appartment as this was basically in a book shelf in my living room, and we never had any issues with that, and it was strange that only this pipe had it (other ones were placed on the stand in a way that dust can't get into the chamber)
Apologize for my stupidity, happy that my favorite mini pipe is still good to smoke