Flynn V, Chisholm C, Grimwood R. J Am Acad Dermatol 2011; 65: 531–6.
Chondrodermatitis nodularis helicis chronicus

First-line therapies
Topical nitroglycerin: a promising treatment option for chondrodermatitis nodularis helicis.
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Reassurance not cancer
Conservative management
Topical corticosteroids
Intralesional corticosteroids
2% topical nitroglycerin