Skin lesions that can be useful in the diagnosis of acute or chronic polyarthritis

Skin lesions that can be useful in the diagnosis of acute or chronic polyarthritis

• Erythema chronicum migrans (Lyme arthritis)

• Erythema nodosum (sarcoid arthritis, enteric arthritis)

• Psoriatic plaques (psoriatic arthritis)

• Keratoderma blennorrhagicum (reactive arthritis)

• Erythema marginatum (acute rheumatic fever)

• Palpable purpura (vasculitis)

• Livedo reticularis (vasculitis, antiphospholipid antibody syndrome)

• Vesiculopustular lesions or hemorrhagic papules (gonococcal arthritis)

• Butterfly rash, discoid lupus, or photosensitive rash (SLE)

• Thickening of the skin, digital pitting/ulcers, telangiectasias (systemic sclerosis)

• Heliotrope rash on eyelids, upper chest, and extensor aspects of joints (dermatomyositis)

• Gottron’s papules overlying the extensor aspects of the metacarpophalangeal and interphalangeal joints of the hands (dermatomyositis)

• Gray/brown skin hyperpigmentation (hemochromatosis)

• Periungual nodules (multicentric reticulohistiocytosis)

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