Gaining

That depends on if your body will have stretch marks as you gain. some get them some don't.
Usually a rapid gain will cause them.
I never got them myself and I'm obese.
I have cellulite in abundance but no stretch marks.

The only place I got stretchmarks is on the lower curve of my fat belly.

I weigh arround. 102 kgs, im 170 tall, and i started gaining 4 years ago, when i weighed 60 kgs 😉
I got them all over my Belly, love handels, my big bubble but and my fat thighs 😅😍
And they are permanent, They just wont stay purple forever they fade with time and become like silver

Feel free to check my account on feabie, there are tons of photos of my progress and, many many stretchmarks as they devolope one by one 😉
Feabie:the***teen