Which one do you have? I am looking at the Eisco Labs Table Top Tesla Coil from Amazon. I have an allergy to mold and we have had some flooding issues in the basement.
Does your son take a bath with some chlorine bleach in it? I had a bad case of eczema this year with infected sores, and that's what the doctor recommended. The infection could have been staph or strep. I also noticed that when I changed my hot tub to chlorine it soothed my skin a little.