CXCR5 and exanthem: In patients with a skin rash, the proliferative activity of CD8Tem, dnCD3T, and CXCR5− DNB were significantly elevated (rash+: 2.031%, rash‐: 0.512%, P = 0.00066; rash+: 0.710%, rash‐: 0.315%, P = 0.00035, and rash+: 0.167%, rash‐: 0.059%, P = 0.00083, respectively).