Differential Diagnosis in Dermatopathology

Photoallergic dermatitis vs. Phototoxic dermatitis

Infection of skin and subcutaneous tissue by atypical mycobacteria, that is, mycobacteria other than those responsible for tuberculosis and leprosy, expressed clinically as keratotic and crusted papules, plaques, nodules, and tumors that may be punc…

Differential Diagnosis in Dermatopathology

Discussions

Photoallergic dermatitis and phototoxic dermatitis, as their names denote, are eruptions induced by ultraviolet light. The two conditions have features in common clinically and histopathologically, a situation that may pose problems in diagnosis for…

Histologic Diagnosis of Inflammatory Skin Diseases

Leukocytoclastic vasculitis

Leukocytoclastic vasculitis Synonyms Leukocytoclastic angiitis Allergic vasculitis Hypersensitivity angiitis Hypersensitivity vasculitis Anaphylactoid purpura Immune complex vasculitis Purpura rheumatica Presentation stereotypical Age and sex Any ag…