Japanese Ribbed Cotton Shelf Bra Tank

bought in japan! SO lovely but i don’t reach for it. has a build in shelf bra (don’t have the inserts but any will do) there’s a small pink stain on the elastic of it, just in the innermost lining though so not at all visible when worn unless your ribs have eyes. no stain on the front, not sure what that is in the first photo. maybe a ghost