The word "mark" comes up a lot in all the books...

[vmonte]

No: HPFGUIDX 95588

Bonny wrote:
What I find even more interesting is that when Crouch!Moody says the 
above line about marks not coming off, Snape clutches his left fore-
arm compulsivly as though in pain. This is the only instance I have 
heard of when mere reference to the mark could cause pain to the 
bearer. Wouldn't that make Snape a little suspicious? I know he 
wouldn't have wanted to look like he was investigating Moody, but he 
must also have known that Moody couldn't have that pain- causing 
power.... unless, of course, there is something I am missing.

vmonte responds:
I didn't take it to mean that Snape felt pain. I understood it more 
as an automatic "unconscious" reaction by Snape to cover the mark 
with his hand.  

By the way the word "mark" comes up a lot in all the books.  In the 
prophecy, in victims/survivors, on the DEs, Mark Evans...interesting.