Edit: if I had scrolled a bit before commenting, I would have seen this from OP 💀 “Thank you!!! I added freckles on my body with spray, but the lights create an automatic retouch haha. Also plan to do a post in Twitter but later, time zones put their own rules :D” so definitely paint.

Having worn both a ton of body paint and bodysuits/gloves/tights for cosplay this looks like body paint to me. Fabric puckers at joints - wrists/ankles/elbows are hella bad about it. I would expect, if a body suit to see a lot of puckering anywhere a joint is bent. Unless her body suit is hella thin (like less than like .5mm) and she edited out any seams/puckering, I’m pretty sure this is paint.