Is this something I should be concerned about?

She seems completely fine otherwise. She's eating, drinking water, playing, cuddling the shit out of me, etc. I'm thinking perhaps her and Sebastian were kitten battling and he yanked out a bit of fur? I don't know. I'm overly protective of my cats because I'm, uh, crazy so now I'm all like OMG SHE NEEDS TO GO FOR BLOOD TESTS RIGHT NOW.

Does she need to go for blood tests right now or should I calm the fuck down?