Overview
What are pigmented purpuric dermatoses?
What causes pigmented purpuric dermatoses?
What causes pigmented purpuric dermatoses?
Are pigmented purpuric dermatoses common in the US?
What is the international incidence of pigmented purpuric dermatoses?
Do pigmented purpuric dermatoses have a racial predilection?
Are pigmented purpuric dermatoses more common in males or females?
Do pigmented purpuric dermatoses have an age predilection?
What is the prognosis of pigmented purpuric dermatoses?
Presentation
How do pigmented purpuric dermatoses present?
How are the variations of pigmented purpuric dermatoses characterized?
DDX
What are the diagnostic considerations of pigmented purpuric dermatoses?
What are the differential diagnoses for Pigmented Purpuric Dermatosis?
Workup
Which lab studies are indicated in the workup of pigmented purpuric dermatoses?
What is the role of dermoscopy in the clinical diagnosis of pigmented purpuric dermatoses?
What other tests may be indicated in the workup of pigmented purpuric dermatoses?
Which procedures are used to confirm the diagnosis of pigmented purpuric dermatoses?
What are the histologic findings of pigmented purpuric dermatoses?
Treatment
How are pigmented purpuric dermatoses treated?
When is a follow-up consultation indicated in the treatment of pigmented purpuric dermatosis?
Medications
What are the goals of drug treatment for pigmented purpuric dermatoses?
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Pigmented purpuric dermatitis affecting the trunk. Some of the lesions show the characteristic orange-brown, speckled, cayenne pepper–like discoloration that is the hallmark clinical sign of a capillaritis. Men are more frequently affected than women. If the lesions are pruritic, then the term itching purpura is sometimes used. Early cutaneous T-cell lymphoma, purpuric clothing contact dermatitis, and drug hypersensitivity reactions should be considered in the differential diagnosis.
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Lichen aureus is the name given to localized pigmented purpuric dermatitis or capillaritis. In this patient, the skin on the extensor surface of the elbow is affected.
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Histologic features of a skin biopsy sample obtained from a patient with lichen aureus shows extravasation of erythrocytes and a perivascular T-cell infiltrate.
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Endothelial cell swelling is a histologic feature of capillaritis. This biopsy sample was obtained from a patient with lichen aureus.
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Hemosiderin deposition is seen in dermal macrophages in this biopsy sample obtained from a patient with lichen aureus.
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Capillaritis affecting the lower legs is known as Schamberg disease. In Schamberg disease, irregular plaques and patches of orange-brown pigmentation develop on the lower limbs.