Has anybody's Yorkie ever had a lump where a vaccination was injected, and if so,

how long did it last? I'm going to call my Vet in the morning, but Gina has a lump on the back of her neck where she got the injection. I don't remember this happening to Megan when she got any of hers. I'm not sure if I should be massaging the lump to break it up or what. Any help would be appreciated. Thank you.
Cheers Quad
__________________
Assume Nothing, Question Everything, Start Thinking!
RIP Megan 3/1998-5/28/2013