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Histologic Diagnosis of Inflammatory Skin Diseases

Pityriasis alba

…especially, but sometimes arms Individual lesions Macules and patches Course Months or years Differential diagnosis clinical Tinea versicolor usually appears on the shoulders, neck, and arms as well-defined macules covered by delicate scales. Finding…

Differential Diagnosis in Dermatopathology

Discussions

…times. When histiocytes are disposed in interstitial array in patches of mycosis fungoides, it may be exceedingly difficult to differentiate the lymphomatous process from that expression of granuloma annulare in which histiocytes are present only in…

Histologic Diagnosis of Inflammatory Skin Diseases

Erysipelas

…remities especially Individual lesions Erythematous edematous patch or plaque with pseudopods at the periphery, topped sometimes by vesicles and/or bullae also at the periphery of the lesion Course Waning in weeks without residua. May recur at the sa…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Palpable Purpura?

…ic macule, and “ecchymosis” designates a purpuric patch. “Hematoma” pertains to a localized swelling filled with blood. All too often, residents in medicine, surgery, and dermatology are unfamiliar with the usage proper of tho…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Toxic Erythema?

…uption. Clinically, fixed drug eruption appears as a solitary patch or plaque, or as several such lesions, often situated on a mucous membrane or on genital skin. A blister may form atop a plaque. In Caucasians, the hue of fixed drug eruption is dist…

Histologic Diagnosis of Inflammatory Skin Diseases

Eosinophilic folliculitis

…f neutrophils. Moreover, findings of mycosis fungoides in the patch stage are present also in surface epidermis, where lymphocytes disposed as solitary units are accompanied by scant spongiosis and mounds of parakeratosis are elongated. Clue to spec…

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