can somone please explane what this is?

hey guys can somone please tell me what this brown "thing" is on the stem of my seedling?[attachment=o220982]
i tryed pulling it off with tweezers but then i hesitated because i didnt want to kill it, but i removed the old seedling shell about 3 hours before and this "thing" was under it.
:wtf: many thanks

Yeah, it's prob just some part of the inside of the shell.

I'd leave it. It should fall off on it's own.

thanks mate, haha its my first grow and even the smallest things worry me:)