Aye
Right children, back on track !!
I have seen a few types of lumps on ferrets. Some around the jaw area are to do with teeth and gum issues but have also seen absesses in the neck /jaw area and these are best drained and cleaned out by a vet.
As I have said before,, If your kid had any problems you couldnt sort out, you would take it to a doctor
Afford your ferrets the same care. If you dont know,,go to a vet. If you dont want to go to a vet, get rid of the ferrets.
(general rant)