Kipawa had this happen with one of his shots. It took about 2 months to go away, and started to really reduce in size with massage. The area is perfectly fine now - you'd never know anything odd had been there.
GE and Modified Live Virus Vaccines; Public Health and Animal Welfare Concerns
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Genetically Engineered and Modified Live Virus Vaccines;Public Health and Animal Welfare Concerns by Michael W. Fox BVetMed,PhD,DSc.MRCVS
http://www.twobitdog.com/drfox/specialreport_Article.aspx?ID=273f53f4-bcdc-474f-a189-cca1d1a81c38This article is in the most recent issue of Journal of the American Holistic Veterinary Medical Association Volume 29, Number 1.