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Lyme disease misdiagnosed as psoriatic arthritis

In their article, “Rare case of Lyme borreliosis in a patient presenting with dactylitis and skin rash,” Steppat et al. describe a patient with Lyme borreliosis, who was initially misdiagnosed with Psoriatic arthritis (PsA), a chronic inflammatory disease that occurs when your immune system mistakenly attacks healthy joints and skin. [1]

A unique presentation of an EM rash

The rash, indicative of Lyme disease, does not always present as a classic “bull’s-eye rash,” as this case report demonstrates. A broad spectrum of lesions has been reported in patients with Lyme disease (LD). In fact, one study found only 6% of the lesions in LD patients had the “classic bull’s-eye or ring-within-a-ring pattern.” [1]