IL2 and alopecia areata: In the alopecia areata group, IL-2 levels averaged 0.365 ± 0.146 pg/mL, with a median of 0.315 pg/mL, closely resembling the control group, which exhibited an average of 0.367 ± 0.312 pg/mL and a median of 0.260 pg/mL (Fig. 2).