Milium

Author: Monisha Gupta FACD, Dermatologist, Sydney, Australia; Amanda Oakley FRACP, Dermatologist, Hamilton, New Zealand, 2009.


What is a milium?

A milium is a small cyst containing keratin (the skin protein); they are usually multiple and are then known as milia. These harmless cysts present as tiny pearly-white bumps just under the surface of the skin.

What are the clinical features of milia?

Milia are common in all ages and both sexes. They most often arise on the face and are particularly prominent on the eyelids and cheeks, but they may occur elsewhere.

There are various kinds of milia.

Neonatal milia

  • Affect 40–50% of newborn babies
  • Few to numerous lesions
  • Often seen on the nose, but may also arise inside the mouth on the mucosa (Epstein pearls) or palate (Bohn nodules) or more widely on the scalp, face and upper trunk
  • Heal spontaneously within a few weeks of birth.

Primary milia in children and adults

  • Found around eyelids, cheeks, forehead and genitalia.
  • In young children, a row of milia may appear along the nasal crease.
  • May clear in a few weeks or persist for months or longer.

Juvenile milia

Milia en plaque

Multiple eruptive milia

  • Crops of numerous milia appear over a few weeks to months.
  • Lesions may be asymptomatic or itchy.
  • Most often affect the face, upper arms and upper trunk.

Traumatic milia

Milia associated with drugs

See more images of milia.

How are milia diagnosed?

Milia have a characteristic appearance. However, on occasion, a skin biopsy may be performed. This shows a small epidermoid cyst coming from a vellus hair follicle.

Milia should be distinguished from other types of cystcomedonesxanthelasma and syringomas. Colloid milia are golden coloured bumps on cheeks and temples associated with excessive exposure to sunlight.

They should also be distinguished from milia-like cysts noted on dermoscopy in seborrhoeic keratoses, papillomatous moles and some basal cell carcinomas.

What is the treatment of milia?

Milia do not need to be treated unless they are a cause for concern for the patient. They often clear up by themselves within a few months. Where possible, further trauma should be minimised to reduce the development of new lesions.

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Related information

 

References

  • Berk DR, Bayliss SJ. Milia: A review and classification. JAAD 2008;59:1050-1063
  • Standard dermatology textbooks by Rook, Bolognia and Fitzpatrick.

On DermNet NZ

Other websites

  • Milia – Medscape Reference

Books about skin diseases