Here we find that B cells isolated from streptococci-infected tonsils or peripheral blood of HLA-C*06:02+ psoriasis patients stimulate an HLA-C*06:02-restricted melanocyte-reactive Vα3S1/Vβ13S1 T-cell receptor (TCR) from a lesional psoriatic CD8+ T cell clone in an IFN-γ-enhanced manner. Here, IFNG is linked to psoriasis.