This educational diagram visually explains the causes of keratosis pilaris, a common skin condition caused by the buildup of keratin that clogs hair follicles. The image illustrates the transition from a normal hair follicle to a plugged follicle, resulting in bumpy, rough skin and potential ingrown hairs. This condition often affects the upper arms, thighs, and cheeks and is more common in individuals with dry skin or eczema.