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Journal of the American Academy of Dermatology
Volume 42, n° 3
pages 442-445 (mars 2000)
Doi : 10.1016/S0190-9622(00)90216-0
accepted : 30 August 1999
Davener’s dermatosis: A variant of friction hypermelanosis
 

Sody A. Naimer, MDa,b, Akiva Trattner, MDc, A. Biton, MDb, I. Avinoach, MDd, D. Vardy, MDe
Beer Sheva and Tel Aviv, Israel 
From the Gush Katif Health Center,a the Department of Family Medicine,b and the Dermatopathology Unit,d Institute of Pathology, Soroka Medical Center, Ben Gurion University of the Negev, Faculty of Health Sciences, Beer Sheva; the Department of Dermatology,c Rabin Medical Center, Beilinson Campus, Petah Tiqva, and Sackler Faculty of Medicine, Tel Aviv University; and the Regional Dermatological Center C, Beer Sheva.e 

Abstract

Background: As part of our clinical experience we encountered a group of patients from a specific population with a similar peculiar pigmentation over the lower dorsal spine. Objective: We investigated these patients to see whether we could determine a common origin. Methods: Patients meeting the inclusion criteria underwent detailed history and complete physical examination; biopsy specimens from 3 patients were studied. Results: All 13 patients were full-time male students at Orthodox Jewish Talmudic seminaries (Yeshivas). The lesion consisted of an elongated, vertical, midline, hyperpigmented patch with indistinct borders, which was distributed along the skin overlying the bony protuberances of the inferior thoracic and lumbar vertebrae. It was often unrecognized by the patients. Mean body mass index was lower than that for the general population. Histologic study showed a marked diffuse hyperkeratosis and hyperplastic epidermis with diffuse hyperpigmentation. We attributed the phenomenon to friction from the rigid backrests against the cutaneous surface of the lower back generated by the characteristic swaying activity that traditionally accompanies Torah study or “davening” (praying) and termed it Davener’s dermatosis. Conclusion: We believe this phenomenon represents a new form of benign friction hypermelanosis. This report highlights the importance of a thorough history in patients presenting with pigmented lesions. (J Am Acad Dermatol 2000;42:442-5.)

The full text of this article is available in PDF format.

 Reprint requests: S. Naimer, MD, Gush Katif Health Center, D.N. Hof Gaza 79779, Israel.



© 2000  American Academy of Dermatology, Inc. Published by Elsevier Masson SAS@@#104157@@
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