Dermatology Practical & Conceptual

Widespread pruritic papules on the trunk and extremities

…with pruritic disorders, including lichen planus and chronic urticaria in two reported cases, suggests that pruritus is a precipitating factor in generalized LA [2,3]. Compared with those cases, there was no history of a previous skin disorder in ou…

Differential Diagnosis in Dermatopathology

Images

Urticaria Urticarial lesions of bullous pemphigoid…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Urticaria Urticarial lesions of bullous pemphigoid 1. Infiltrate of inflammatory cells usually sparse 1. Infiltrate of inflammatory cells usually moderately dense 2. Infiltration of inflammatory cells spares the papillary dermis and the epider…

Histologic Diagnosis of Inflammatory Skin Diseases

Blister secondary to hypoxemia and local pressure

…e expressions of inflammatory skin disease of the skin, e.g., urticaria, erythema multiforme, erythema nodosum, leukocytoclastic vasculitis, and Sweet’s syndrome, to mention only a few of scores of them, it being a distinctive pattern histopath…

Histologic Diagnosis of Inflammatory Skin Diseases

Sweet’s syndrome

…sites exposed to sunlight, especially the face and forearms. Urticaria is typified by evanescent, pruritic, usually widespread lesions. Findings histopathologic Early Small nodular infiltrates of neutrophils and nuclear “dust” of neutr…

Histologic Diagnosis of Inflammatory Skin Diseases

Pityriasis rosea

…ed persons, especially Africans and African-Americans. In the urticarial variant, papules are edematous and affiliated with hardly any scale. The localized variant is cervicofacial, for example. The purpuric variant occurs mainly in children. In the…

Differential Diagnosis in Dermatopathology

Discussions

…inical of many lesions of juvenile xanthogranuloma is nodular urticaria pigmentosa. Clinically, the two may be nearly indistinguishable from one another, but the lesions made up of mast cells urticate when they are rubbed, a phenomenon known as Darie…