JoJo Siwa pair of long sleeve shirts 4

Light pink with dark gray sleeves JoJo and BowBow is Jumping Beans size 4. There is one nickel-sized perfectly round dark spot on shirt (shown in photos) that was treated and did not come clean. I have no idea what it is or what may have been attached here at one time. Pink long sleeve JoJo shirt is Nickelodeon, size xs 4/5, And has a couple dark spots on one of the sleeves near shoulder – was treated and did mostly disappear, but still faintly visible.