Milia: a Review and Classification
Milia: A review and classification David R. Berk, MD, and Susan J. Bayliss, MD Saint Louis, Missouri Milia are frequently encountered as a primary or secondary patient concern in pediatric and adult clinics, and in general or surgical dermatology practice. Nevertheless, there are few studies on the origin of milia and, to our knowledge, there is no previous comprehensive review of the subject. We review the various forms of milia, highlighting rare variants including genodermatosis-associated milia, and present an updated classification. ( J Am Acad Dermatol 2008;59:1050-63.) ilia (singular: milium) are small (generally # 3 mm) white, benign, superficial kerat- Abbreviations used: inous cysts. Histologically, they resemble APL: atrichia with papular lesions M BCNS: Basal cell nevus syndrome miniature infundibular cysts, containing walls of BDCS: Bazex-Dupre-Christol syndrome stratified squamous epithelium several layers thick BFH: basaloid follicular hamartoma with a granular cell layer (Fig 1). Although benign CK: cytokeratin EB: epidermolysis bullosa primary milia are commonly encountered in clinical EBS: epidermolysis bullosa simplex practice, milia also occur in a variety of other condi- EVHC: eruptive vellus hair cyst tions, many of which are rare. They may arise either GBFHS: generalized basaloid follicular hamartoma syndrome spontaneously (primary milia) or secondary to var- MEM: multiple eruptive milia ious processes (secondary milia), as few or many MEP: milia en plaque lesions, and isolated or associated with other clinical MUS: Marie-Unna hypotrichosis 1 OFDS: orofaciodigital syndrome findings. Hubler et al proposed dividing milia into OMIM: Online Mendelian Inheritance in Man primary, secondary, and ‘‘other’’ types, a classifica- PC: pachyonychia congenita tion that Wolfe and Gurevitch2 modified.
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