Queen size Japanese futon mattress

Only used it for 5 nights, very new condition. Only a tiny stain as big as a little finger nail. Premium Foam Japanese Futon Floor Mattress Queen Size 60"x 80",100% High Density Foam Comfortable Floor Mattress,3.2" Thicken Foldable Sleeping Pad,Dormitory Tatami Mat Pick up near Mount Pleasant station, DM for address. Cash only