Slight thinning patch on head???

Sasha has a slight patch of thinning hair on her head that is not looking inflamed or scabby in any way, just literally a bit see through any ideas as to what may cause that to happen?? She is 6.5 months old, Fed on Orijen/Acana Has raw meats and cooked meats too, also been supplementing for 2 weeks with yumpro bioactive and a week on omega 3 fish oil with vit e.
The patch appeared just before the supplements started and has got no worse or better in that time

Anyone?????

It is vaguely circular, right in the middle of the head if viewed from above?

If so, it's something I notice a lot in staffies. In rescue it seems to worsen if they're stressed, but it does seem to be a staffie thing. Someone else might know more, but until then I wouldn't worry about it!

I'd never heard of this so had a little google. Seems there are zillions of posts about Staffies 'going a bit thin on top' out there on the web with various reasons put forward.

So, obviously, it is nothing unusual.

No it is on one side of the top of her head and not the thinning hair that they get behind the ears arm pits etc, it's a one off odd patch?