Immunohistochemical analysis (Figure 7B) confirmed the upregulation of CTSK, SNX9, GLS1, and P‐SMAD3 in the lung tissues of patients with PF, while multiplex immunofluorescence revealed their colocalization with accompanying upregulation in fibrotic lung tissues (Figure 7C). The gene discussed is SNX9; the disease is pemphigus foliaceus.