Sometimes those knots stay a loooooong time. Ringo got his CD/T in December and he still has a knot. Spice has had hers since then (early spring) and she still has a knot too. I'm sure they go away eventually, but around here the knots stay a while. Doesn't seem to bother them, though.
One of my yearlings still has a lump from last year. Info I have on this is that it's caused by the binder in the CDT vaccine. The shot still works if the goat has a lump. Some breeders give the C&D and tetanus shots seperately to avoid the lumps. I find it more economical to give the combo vaccine. Kathie
Lots of my goats have knots, which don't seem to bother them, but I'd rather they didn't have them. Next time I'll try giving the shots seperately and see if that helps. I don't have all that many to vaccinate so it shouldn't be too expensive, plus I'm vain, and you can't put a price on that. :biggrin