Andrew Huberman· PhD
If the top layers of the epidermis are damaged, those stem cells can become activated. And you also have the stem cells that give rise to hair follicles. What happens is the top layers of the skin are basically burned off by a very low level of burn andor the cells in the deeper layer start to churn out new cells which go and rescue the lesion essentially clear out the lesion and replace that lesion with healthy skin cells.