Just a mark or something else?

[SneakyPete]

So I don't have a picture unfortunatly because my camera can't take one good enough to show it. My female clown has a whitish mark on the top of her head a little in front of her dorsal fin. It isn't bright white, but i don't remember her having that when I got her. She has had it for about 2 weeks in my QT (been in QT for 3), or at least that was when i noticed it. I looked at pictures on the web, it doesn't look like ich. It isn't dots. It looks more like a small smudge if you know what I mean. No signs of labored breathing, actively swimming (and defending) around the tank, actively eating. So no real signs of anything, i'm just wondering if it is just a mark that I didn't see when i first got her or what... I thought maybe a scratch from the PBC, but it doesn't seem to get any smaller (or bigger).

Just wondering if anybody has seen anything like that. I'm not worried, i figured if it was ich, it would have moved on to another stage and recessed, or gotten worse.