I was seeing the allergist for my eczema and he asked me if I experienced symptom relief when traveling abroad, which I did in Honduras. He thought I may have been exposed to a parasite there that diverted my overactive immune response. go figure.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3149054/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1856386/