Visible signs may be different and also the severity may change from slight scaling reminiscent of dry skin to very strong scaling.
Scaling of the epidermis is a normal physiological process. From the deeper layers of the epidermis, the cells move towards the skin surface and differentiate; then they die and scale off in the form of microscopically small hornified cells. If the process is disturbed, the epidermis may undergo a quicker regeneration. Due to a too rapid shifting of cells towards the skin surface, keratinization is incomplete. The result is that the dead cells scale off in larger clumps composed of as many as several hundred agglomerated cells.