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Clin Exp Dermatol. 2009 Apr;34(3):358-9. doi: 10.1111/j.1365-2230.2008.02915.x. Epub 2008 Oct 29.

Chondrodermatitis nodularis chronica helicis in monozygotic twins.

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  • 1Department of Dermatology, University of California, San Francisco, CA 94143-0989, USA.


Chondrodermatitis nodularis chronica helicis (CNCH) is a benign inflammatory nodule of the helix. Patients report severe tenderness upon pressure. Commonly seen in middle-aged men, there are no reports of this disease in twins. We report middle-aged male monozygotic twins who simultaneously developed CNCH. This suggests, but does not prove, the possibility of a hereditary factor in the pathogenesis of CNCH.

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