In a previous study, the abundance of Psathyrella was significantly associated with Crohn’s disease, supporting the results of a previous study showing that IL-17 was essential for host defence against fungal infection.44 Notably, the genera Bovista and Erysiphe showed significantly positive correlations with clinical scores, suggesting their involvement in the aggravation of OLP. The gene discussed is IL17A; the disease is Crohn disease.