The epidermis undergoes continuous renewal through a process called keratinization. Basal cells in the stratum basale divide and move upwards, differentiating into keratinocytes. As they progress through the layers, they undergo changes such as the accumulation of keratin and the loss of their nuclei and organelles. This process takes approximately 4-6 weeks, culminating in the shedding of dead cells from the stratum corneum.
