<unk>  is a disorder of the<unk>  glands in which they become enlarged, producing flesh-colored or yellowish, shiny, often umbilicated bumps on the face. Newly formed nodules often swell with sweating (which is pathognomonic for the condition), but this diminishes over time.<unk>  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.<unk>  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. In infants, acne is sometimes associated with<unk> . File:Photography of<unk> .Photography of<unk> , showing a group of papules, in this case on the chest with linear distribution pattern. File:Dermoscopy of<unk> .Dermoscopy of<unk> . Note the aggregation of yellowish-white clods with linear vessels between or above the clods. File:High dynamic range dermoscopy of<unk> .Dermoscopy of<unk>  with digital high dynamic range. Note the multi-lobulated clods with central openings. File:Histopathology of<unk> .H&E staining of biopsied lesion of<unk> : Note the multiple, mature<unk>  lobules attached to the central dilated duct in the upper dermis. File:Malignant Melanoma right temple medial adjacent<unk>  right temple lateral.Sebaceous<unk> , lateral right temple marked for biopsy with adjacent malignant melanoma in situ, evolving, medial right temple File:Sebaceaous<unk>  Chronic folliculits Right Mid Chest.Sebaceous<unk>  with surrounding chronic folliculitis, right mid chest
Sebaceous hyperplasia
Pearly penile papules
Keratin implantation cyst
Cutaneous columnar cyst
Keratin pearl
Corpora arenacea
Corpora amylacea
Sebaceous cyst