Danggui Buxue and Buyang Huanwu decoctions, as well as other classical prescriptions for supplementing Qi and activating blood circulation, are also protective in animal models of PF in vivo. These prescriptions inhibit pulmonary inflammation, collagen deposition, and the epithelial-to-mesenchymal transition by suppressing the TGF-β1 signaling pathway [28, 29]. Here, TGFB1 is linked to pemphigus foliaceus.