TGFb1 has an important role in psoriasis: Increased epidermal and serum TGFb1 levels correlate with disease severity, and mouse models with keratinocyte‐specific human TGFb1 overexpression (K5.hTGFb1wt) recapitulate the human disease (Han et al, 2010). Here, TGFB1 is linked to psoriasis.