Hello from JA
I am Dr. Thomas, board certified in internal medicine and integrative medicine, so I can cover about any question you might have, as well as your follow up questions. Use reply to expert at any time you need to.
If the rash is 20 years old it is not likely infectious.
In might be eczema, or another autoimmune
What you need to do is
a. have a dermatologist look at the rash.
b. have a piece of the rash sent to the lab for identification.
No it has nothing to do with systemic fungal infection, that is largely a myth, and it is not how fungal infection works.
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