Fig. 2.

(a) Distribution of $L*$ values for all subjects, measured in the ventral forearm and palm. The ventral forearm $L*$ values follow a bimodal distribution ($L*<50$ represents patients with darker skin), whereas the palm values follow a unimodal distribution. The color scale is arranged by ventral forearm $L*$ value, where blue is low $L*$ (dark skin) and red is high $L*$ (light skin). This color scheme is repeated throughout this report. (b) The $L*$ values for the ventral forearm and palm are nearly identical for patients with lighter skin, but the $L*$ values of the palm are systematically higher than those of the ventral forearm for patients with dark skin.