Bilateral knee pain x 3 yrs, negative ANA, ESR, CRP. XR neg, | Figure 1
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Bilateral knee pain x 3 yrs, negative ANA, ESR, CRP. XR neg, Red, lacy rash comes/goes. Rash hot, blanchable. Relieved with NSAIDs. No swelling seen. No rashes in other joints. Similar butterfly rash on face. Low c3 and c4. Dx ideas?
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