What integumentary gland secretes sebum?
The secretion of sebaceous gland is called sebum. This gland is most frequently found in the skin of face and scalp. It is associated with hair follicle.
Following is a diagram of sebaceous gland, here we can see sebum is being secreted.
Sebum contains lipid (fat) and, is more viscous than the sweat. Sweat is the secretion of sweat gland (another gland of integumentary system). Acne is formed, when the flow of sebum is blocked.