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Logo of annaldermaThis ArticleThis JournalAboutInformation for AuthorsOnline SubmissionAnnals of Dermatology
 
Ann Dermatol. 2010 November; 22(4): 465–467.
Published online 2010 November 5. doi:  10.5021/ad.2010.22.4.465
PMCID: PMC2991730

Idiopathic Multiple Eruptive Milia Occurred in Unusual Sites

Eujin Cho, M.D., Sang Hyun Cho, M.D., Ph.D., and Jeong Deuk Lee, M.D., Ph.D.corresponding author

Abstract

Milia are small, white, benign keratinous cysts that are frequently encountered. Multiple eruptive milia are rare, and are characterized by the development of milia that are more extensive in number and distribution than would be expected in primary milia. We report a case of a 19-year-old girl with tiny, white papules in her axillae and on her abdomen with a review of the relevant literature.

Keywords: Multiple eruptive milia

INTRODUCTION

Milia are small, epithelium-lined keratinous cysts in the dermis thought to result from plugging of pilosebaceous or eccrine sweat ducts. Milia present as 1~2 mm, white, domed papules, most commonly on the face. They may appear spontaneously (primary milia) or after clearing of inflammatory skin diseases and trauma (secondary milia)1. Multiple eruptive milia represent an unusual condition in which numerous lesions develop suddenly on the face and trunk. We describe a case of multiple eruptive milia spontaneously occurred in unusual sites in a 19-year-old girl.

CASE REPORT

A 19-year-old girl presented with asymptomatic, white papules on the abdomen and in both axillae that began to develop 5 years prior to her presentation. The patient was otherwise in good health, and there was no history of trauma or excessive exposure to sunlight. No similar eruptions were noted in family members. Cutaneous examination revealed multiple, white, firm, discrete, 1~2 mm papules on the abdomen and in both axillae (Fig. 1). Histologic examination of the lesions revealed two subepidermal keratin-filled cysts lined with stratified epithelium(Fig. 2). No treatment was desired or administered.

Fig. 1
Multiple, white, 1~2 mm papules are noted on the abdomen and both axillae.
Fig. 2
The histopathologic features show small keratin-filled cysts in the superficial dermis (H&E, ×100).

DISCUSSION

Milia can be classified as primary or secondary. Primary milia develop spontaneously and are common on the faces of newborns. Primary milia may also be present on the trunk and extremities. In children and adults, primary milia are found mainly on the eyelids and cheeks. Secondary milia may occur anywhere following trauma, for example burns, subepidermal blistering diseases, dermabrasion, radiotherapy, or following topical therapy with glucocorticoids or 5-fluorouracil1. Secondary milia may also be associated with certain genodermatoses. Other patterns of milia include milia en plaque and multiple eruptive milia. Milia en plaque is characterized by multiple, minute, white papules within an erythematous plaque, commonly located on the ears2.

The first report of multiple eruptive milia was published by Miescher3 in 1957. Miescher3 described a case of multiple eruptive milia associated with multiple trichoepitheliomas on the face, thought to be an example of the multiple trichoepithelial syndrome. Langley et al.4 classified multiple eruptive milia into three categories: 1) spontaneous without a known cause or association (i.e., idiopathic); 2) a familial pattern with autosomal dominant transmission, and, 3) a component of a genodermatosis. Only six cases of idiopathic multiple eruptive milia have been reported in the English literature (Table 1)4-9, and two cases have been reported in the Korean dermatologic literature10,11. Reported sites of occurrence include the face, scalp, neck, upper trunk, shoulders, and arms. This is the first reported case of idiopathic multiple eruptive milia on the abdomen and axillae. Formerly, the localization of multiple eruptive milia to sun-exposed areas, such as the head, neck, and chest, led some authors to suggest sunlight as a precipitating factor4. As our patient developed milia in non-sun-exposed skin, however, we suggest that stimuli other than sunlight play a role in the pathogenesis of multiple eruptive milia. The causative factor for multiple eruptive milia remains unclear. However, external stimuli such as friction or rubbing may cause invaginations of epidermal cells and result in multiple eruptive milia.

Table 1
Cases of spontaneous multiple eruptive milia in the English literature

Multiple eruptive milia have also been described in families with autosomal dominant transmission4. Published cases include a father and son presented with eruptive milia on the face, neck, shoulders, upper back, and axillae who were otherwise healthy12, and a mother and son with lesions on the face and upper trunk13. In the latter, the son also had striate leukonychia. Multiple eruptive milia have also been reported in association with genodermatoses, such as the basaloid follicular harmatoma syndrome, Rombo syndrome, Bazex syndrome, orofacodigital syndrome I, and Gardners syndrome1.

Differential diagnoses of multiple eruptive milia include miliaria crystallina, eruptive syringoma, eruptive vellus hair cyst, and verruca plana. Generalized idiopathic calcinosis cutis mimicking multiple eruptive milia has also been reported, and requires differentiation14. Commonly administered treatment modalities for milia include excision, followed by extrusion of the keratin core, carbon dioxide laser, curettage, mild electrocautery, and electrodessication9. Successful treatment has also been reported with topical tretinoin and ER: YAG laser1.

In summary, we report our experience of a patient with a 5-year history of multiple eruptive milia on her abdomen and in her axillae with no definite causative factor, which represents a rare case of idiopathic multiple eruptive milia that occurred in unusual sites.

References

1. Berk DR, Bayliss SJ. Milia: a review and classification. J Am Acad Dermatol. 2008;59:1050–1063. [PubMed]
2. Cho SH, Chae KS, Park YM, Cho BK. Milia en plaque. Ann Dermatol. 1997;9:174–176.
3. Miescher G. Eruptive milia and Brooke's epithelioma adenoides cysticum. Dermatologica. 1957;115:712–716. [PubMed]
4. Langley RG, Walsh NM, Ross JB. Multiple eruptive milia: report of a case, review of the literature, and a classification. J Am Acad Dermatol. 1997;37:353–356. [PubMed]
5. Thies W, Schwarz E. Multiple eruptive milia-an organoid follicle hamartoma. Arch Klin Exp Dermatol. 1961;214:21–34. [PubMed]
6. Wolfe SF, Gurevitch AW. Eruptive milia. Cutis. 1997;60:183–184. [PubMed]
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9. Diba VC, Handfield-Jones S, Rytina E, Hall P, Burrows N. Multiple eruptive milia in a 9-year-old boy. Pediatr Dermatol. 2008;25:474–476. [PubMed]
10. Kim MY, Lee HJ, Kim JW. A case of multiple eruptive milia. Korean J Dermatol. 2001;39:348–350.
11. Kim JY, Park SJ, Yi JA, Lee WJ. A case of multiple eruptive milia occurring on both external ears. Korean J Dermatol. 2004;42:1212–1214.
12. Heard MG, Horton WH, Hambrick GW., Jr The familial occurrence of multiple eruptive milia. Birth Defects Orig Artic Ser. 1971;7:333–337. [PubMed]
13. Schimpf A, Pons F. Multiple eruptive milia and striated leuconychia. Z Hautkr. 1974;49:207–214. [PubMed]
14. Mehta JN, Berk DR, Hanson SG, Lind AC, Mallory SB. Generalized milialike idiopathic calcinosis cutis. Arch Dermatol. 2006;142:1238–1239. [PubMed]

Articles from Annals of Dermatology are provided here courtesy of Korean Dermatological Association and Korean Society for Investigative Dermatology