TBCE and keloid: Overall, various MSC-exos, mainly derived from ADSCs, BMSCs, hUC-MSCs, iPSCs, EPSCs, FD-MSCs, USCs, OMLP-PCs, MenSCs, WJ-MSCs, hAMSCs, hAFSCs, and hESCs, play a role in promoting the activity of fibroblasts, KCs, immune cells, and ECs in diabetic wounds, inflammatory wound repair, and even wound-related keloid formation.