Histologic Diagnosis of Inflammatory Skin Diseases

Erythema nodosum

…h true erythema nodosum; it is a manifestation of lepromatous leprosy “in reaction.” Last it must be emphasized that erythema nodosum, like erythema multiforme, leukocytoclastic vasculitis, Sweet’s syndrome, pyoderma gangrenosum, an…

Differential Diagnosis in Dermatopathology

Photoallergic dermatitis vs. Phototoxic dermatitis

…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 punctuated by draining sinuses and by ulcers….

Differential Diagnosis in Dermatopathology

Discussions

…homa or leukemia and, stereotypically, those with lepromatous leprosy. In brief, actinic reticuloid is a euphemism for persistent photoallergic dermatitis, i.e., persistent light eruption, that, because of infuriating pruritus, prompts vigorous and p…

Histologic Diagnosis of Inflammatory Skin Diseases

Miescher’s granuloma of the face

…SH, Spaas JJ. Granuloma multiforme. A new disease resembling leprosy. Int J Lepr 1964;32: 368–70. Mehregan AH, Altman J. Miescher’s granuloma of the face. A variant of the necrobiosis lipoidica-granuloma annulare spectrum. Arch Dermatol 1973;1…