Many inflammatory cytokines play a role in the pathogenesis of psoriasis, and many of these cytokines require the activation of the JAK/STAT signaling pathway to play their role. The effect of JAK family inhibitors in reducing the symptoms of psoriasis has been proven in many studies. TYK2 is a member of the JAK kinase family, which plays a role in the signaling pathway of IL-12, IL-23 and type I IFNs. Due to the importance of TYK2 in inflammatory cytokine signaling, TYK2 inhibitors have been used in several inflammatory diseases such as psoriasis, lupus, Crohn's, psoriatic arthritis, and ulcerative colitis.