How long is the self-recovery cycle for damaged stratum corneum?

The self-recovery cycle of damaged stratum corneum varies among individuals, but generally, the repair process can be divided into several stages. After damage to the stratum corneum, the skin enters a repair phase, which typically takes about 2–4 weeks. This is based on the fundamental epidermal turnover cycle: approximately 14 days for cells to migrate from the basal layer to the outermost layer, followed by another 14 days for desquamation through the stratum corneum. If the damage to the stratum corneum is more severe, the repair time may extend to around four weeks, or approximately 28 days, as the skin requires additional time to regenerate and properly arrange healthy keratinocytes. Moreover, the healing duration is also influenced by individual constitution and skin condition—some people may recover faster, while others may require a longer recovery period.