Mystery Stain on Softstreme Cropped Crew? Please help!

I've seen a couple subreddits on here and it seems that some dish soap will do the trick? But I just wanna make sure because of the specific material of this crewneck.

It's brand new (first time wearing) and I don't recall a stain when I was trying it on in store (would not have purchased it if I had seen it) so I'm not sure where it came from? But I'm hoping to get rid of it without compromising the entire thing.

Please help🥺