J Crew Flawed Soleil Graphic Vintage Jersey Tee Small FLAW Read

There is a long green mark on the front. Shirt has been washed once without any stain removal, and it didn't come off, so I cannot guarantee it will. Maybe someone who is expert in stain removal can work their magic! I'm not sure what it is. It looked like a pen/marker, but slightly comes off when you scratch it. See all the pictures carefully, last pictures show the location and close ups! The back has a big graphic, so could also be used as a DIY project. Measurements in the pictures 100% cotton