Sebaceous hyperplasia is a disorder of the sebaceous glands in which they become enlarged,:662 producing yellow, shiny bumps on the face.
Sebaceous glands are glands located within the skin and are responsible for secreting an oily substance named sebum. They are commonly associated with hair follicles but they can be found in hairless regions of the skin as well. Their secretion lubricates the skin, protecting it from drying out or becoming irritated.
Sebaceous hyperplasia generally affects newborns as well as middle-aged to elderly adults. The symptoms of this condition are 1–5 mm papules on the skin, mainly on the forehead, nose and cheeks, and seborrheic facial skin. The papules may be cauliflower-shaped. Acne is also a symptom of this glandular disorder. It differs from the type of acne that affects adolescents and young adults in that it is of a more abnormally discolored composition.