Sebaceous glands :
In addition to palms and soles, the sebaceous glands are also found in the skin of all the body parts. It is also responsible for dense hairs.
Such types of glands are found more on those body parts having extra hairs. The hairs and skin are become dry in absence of sebum and due to excessiveness of it; a thin layer is appeared on the skin that goes on falling down later. Dandruff on the head is the best example of it. In childhood, sebaceous glands are comparatively less active. Like this, they are also less active in old age, due to which the secretion of sebum is decreased and the skin as well as hairs remains dry.