Abstract
A 52-year-old female presented with 1-week history of an asymptomatic eruption on the right knee. This started as blanched patches that progressed over a few days to raised urticarial papules. Prior to the onset of the eruption, she had been using a cold therapy device on this knee for 3 weeks after arthroscopy and medial meniscus repair. On examination, there were smooth indurated round papules localized to the right anterior knee. A punch biopsy was obtained revealing a superficial and deep perivascular lymphocytic infiltrate extending into the subcutis, consistent with cold panniculitis.
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