My Vinnie got his lump about one week afters his vacs,but it was an oblong lump about 8cm long,very squishy.
Worried,I took him to the vet,she said it's a VERY uncommon reaction to the vacs,but I found out here on the Forum,it is not that uncommon.
He had his lump for about 3 weeks and now it's totally gone.
Thank's Dr Lee for giving us all the info