Question

areas of the mammalian skin in which sweat glands and hairs are absent

Answer 1

Sebaceous glands are absent from the palms and the soles. They are simple alveolar glands that form lobes in the dermis, generally in the acute angle between an arrector pili and its hair follicle. ... Fat-soluble substances may penetrate the skin through hair follicles and sebaceous glands.

Answer 2

The sebaceous glands are glandsfound in the skin of mammals. They secrete an oily substance called sebum (Latin, meaning fat or tallow) that is made of fat (lipids) and the debris of dead fat-producing cells. ... The structure consisting of hair, hairfollicle and sebaceous gland is also known as pilosebaceous unit.