CD8A and vitiligo: Besides, the number and function of regulatory T cells (Tregs) which actively suppress CD8+ T cells‐mediated immune responses is observed to be suppressed in vitiligo.[21] In this regard, the dysregulation of both the number and function of CD8+ T cells and Tregs greatly accounts for the abnormal autoimmue response in vitiligo.[22] Therefore, we further evaluated the effect of hUMSCs‐Exos on CD8+ T and Treg cells infiltration and function in vitiligo mice by using flow cytometry.