Rash on back

Im getting a huge Rash from the tens unit prolonged use many years. I have hepitca giantica (large flukes) with large mouths and huge tapes and huge ascarias. I had hundreds of smaller worms i killed with ICU protocol but nothing wld touch the lg ones. I use the tens unit to keep them still as i have to work and im still in bad shape, has anyone else gotten a rash from the tens unit? I never had any problems until this yr. Any ideas on how to make the rash go away? Im using melaluca oil on it. And gonna take Bentonite clay baths.