Baby chick hatchery marking

[Chicken_Chick12]

Hi, I’m new to raising chicks so all information is awesome! I have a baby chick, and under her wing is bright pink/purple I called the store where I got her from and they said that they sometimes they mark them at the hatchery. None of my other chicks have color so I’m just wondering if I should be concerned or if it’s just marking from the hatchery I can’t tell if the color is on her skin or just fluff. It looks much brighter in person than in the picture. Thank you!

 

[rosemarythyme]

This is just a wild guess, but maybe it's stray dye, either from another bird that had dye in the same shipment, or someone at the hatchery handling them with a bit of leftover dye on their fingers?