I don't see the vets helping lately so, what kind of zapper?
The only one that I know that burns is don crofts, the other ones
can sting after a while, perhaps burn if you fall asleep.
Anyone who zaps better be consuming a whole
bunch of water! See the Water Cure forum and some suggestions for water
ionizers or vitalyzers. But, by all means get plenty of clean water going.
Was the lump there before the zap? Have you had it looked at? Anyway, with
any type zap, starting slow is best, never sleep with it on. PT