EGFR and hydrops fetalis: In the BP category, the DEGs were enriched in the related processes of HF development and differentiation, including the regulation and processes of the hair cycle, HF development, skin epidermis development, regulation of HF development, positive regulation of HF development, skin development, the Wnt signaling pathway, epidermal growth factor receptor signaling pathway, BMP signaling pathway, epithelial cell differentiation, and epithelial cell development (Figure 3A).