We took Molly yesterday for her yearly.  They took blood and we immediately noticed a golf ball sized knot on her neck.  She didn't seem fazed and the doctor said it was normal and that it would bruise up.  So we didn't really think too much about it, I mean every time I have blood taken I get softball sized bruises.  

This was it yesterday evening:
 
It's a little dark but nothing too bad, about an inch in length and width. 

Here it is this evening


sorry for the crappy picture, but the purple from her neck to the top of her chest is purple, and the knot has traveled down.  It is now about 4 inches long and 2 inches wide. 

Has this ever happened to anyone else??  I'm defintely either calling or running her to the vet first thing in the morning.  They said the reason it formed is because the only place they can get a good amount of blood is by taking it from the jugular and it's just like a human that bruises after blood is taken.  But should it be THAT big??