varnish exclude parts

[X.H.R.F.C.]

Hello,

Is there any way to exclude some webpage parts from cache?
For example i have an website where i auth users trough openid, provider steam and after i finish auth i show some avatar and a logout button - i use a cookie to log them in.
The problem is that i have a lot of pages that will never change in the future, but this avatar is on every website page. How can i cache the entyre page, except this avatar portion?
If you can provide some vcl code, i'll appreciate, i'm a complete beginner to varnish.


Best Regards,
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