Pathogenesis: The cause is unknown, but the cysts are believed to be derived from the hair follicle, sebaceous gland, or eccrine gland epithelium. Secondary milia occur after subepidermal blistering or trauma that interrupts the epidermal-dermal junction.

Treatment: No therapy is required. Most milia are found during routine skin examinations and are brought to the attention of the patient for education. Patients are often unaware of the milia. If a patient is bothered by the appearance of the cyst, extraction with a comedone extractor after creating a tiny (1-mm) incision with a no. 11 blade is all that is required for removal. Once the cyst is removed, it almost never recurs, although other milia may develop after extraction. Treatment of congenital milia in infants is not required because they almost all resolve spontaneously.

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