are they found in animals too?
Yes - only in mammals
Sebaceous gland
A sebaceous gland is a microscopic exocrine gland in the skin that opens into a hair follicle to secrete an oily or waxy matter, called sebum, which lubricates the hair and skin of mammals.
infection of the sebaceous gland and the formation of pimples Acne any particular place where these glands are found? In humans, sebaceous glands occur on all parts of the skin except the palms of the hands and soles of the feet. when do they develop? They are first visible from the 13th to the 16th week of fetal development then the Sebaceous glands develop from the same tissue that gives rise to the epidermis of the skin. what do they do? They secrete the oily, waxy substance called 'sebum' what purpose does this secretion serve? To lubricate the skin and hair do they provide immunity of any sorts? Yes - to protect the body against microorganisms. Sebaceous glands secrete acids to form a thin, slightly acidic film on the surface of the skin that acts as a barrier to microbes.
wiki:7481270
Sebaceous gland [SEP] Introduction
A sebaceous gland is a microscopic exocrine gland in the skin that opens into a hair follicle to secrete an oily or waxy matter, called sebum, which lubricates the hair and skin of mammals. In humans, sebaceous glands occur in the greatest number on the face and scalp, but also on all parts of the skin except the palms of the hands and soles of the feet. In the eyelids, meibomian glands, also called tarsal glands, are a type of sebaceous gland that secrete a special type of sebum into tears. Surrounding the female nipple, areolar glands are specialized sebaceous glands for lubricating the nipple.