Milia are benign superficial white-yellow keratinaceous cysts that typically present on the eyelids, forehead, and face but may present anywhere (Fig. 45.1). They occur at all ages and are very common.
Small milia on face of a 37-year-old female
Age: any age; most common in newborns and adults
Precipitating factors: These are most frequently sporadic lesions but they can be associated with subepidermal blistering diseases such as porphyria cutanea tarda, epidermolysis bullosa acquisita, varicella zoster virus, bullous pemphigoid, and bullous lichen planus. They are also associated with skin trauma such as abrasions, burns, dermatologic surgery, ablative and nonablative fractional resurfacing, CO2 resurfacing, and radiation therapy. They may also occur following treatment with topical 5-fluorouracil, topical corticosteroids, and microdermabrasion
Milia are believed to be retention cysts derived from vellus hair follicles. Milia secondary to trauma or bullous diseases arise from ectopic hair follicles.
They represent small epidermoid cysts and feature characteristic stratified squamous epithelium with laminated keratin debris. A granular layer is present in the cyst wall.
Milia present as 1 to 4 mm superficial white-yellow cysts that most commonly appear on the eyelids, cheeks, and forehead.
Their clinical appearance is characteristic.
They can present at any age and do not resolve without intervention.
KEY CONSULTATIVE QUESTIONS
Is there any history of blistering or trauma?
There is no medical indication to treat milia. The cosmetic appearance, however, may displease some individuals.
(A) Lancet piercing a milium on the left lower anterior neck of a patient. (B) Comedone extractor extruding keratinaceous debris from milium. (C) Postprocedure resolution of milium after comedone extraction
– Local anesthesia may be required.
– Incision with a #11 blade and removal of keratinaceous debris with pressure from comedone extractor, microvascular forceps, or cotton swab tips.
– The procedure is fast, simple, and effective.