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Jamison E. Strahan, MD; Mayumi Fujita, MD, PhD
University of Colorado at Denver and Health Sciences Center, Aurora

Arch Dermatol. 2009;145(6):715-720.

	Since this article does not have an abstract, we have provided the first 146 words of the full text and any section headings.

REPORT OF A CASE

A 69-year-old white woman presented with an 8-month history of a reddish nodule on her right knee. She had initially noted the lesion after she bumped her knee on a cabinet drawer. The nodule had begun as a small pimplelike lesion and had progressively and slowly grown over the next several months. The patient, who was in otherwise good health, denied any other symptoms. She had no history of skin cancers or atypical moles and no family history of melanoma.

Physical examination revealed a 2-cm, violaceous, conical-shaped nodule, which was firm, nontender, and freely mobile, with a smooth surface and a small central crust (Figure 1). There was no lymphadenopathy. A punch biopsy specimen was obtained for histopathologic examination (Figure 2 and Figure 3).

Figure appears in full text version. Figure 1.

Figure appears in full text version. Figure 2.

Figure appears in full text version. Figure 3.

What is your diagnosis?

SECTION EDITOR: MARY S. STONE, MD; ASSISTANT SECTION EDITORS: SOON BAHRAMI, MD; CARRIE ANN R. CUSACK, MD; SENAIT W. DYSON, MD; MOLLY A. HINSHAW, MD; VINCENT LIU, MD

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A Violaceous Nodule on the Knee—Diagnosis
Arch Dermatol. 2009;145(6):715-720.
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