According to Li et al., oral administration of abietic acid reduces PASI scores, modifies the balance of Th17/Treg cells in the mouse spleen, and downregulates serum cytokines like TNF-α, IL-17A, TGF-1β, and IL-23 to alleviate IMQ-induced psoriasis-like skin inflammation (36, 37). Here, TNF is linked to psoriasis.