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Histologic Diagnosis of Inflammatory Skin Diseases

Pityriasis alba

Pityriasis alba Synonyms Pseudoleukoderma Presentation stereotypical Age and sex Children usually Distribution of lesions Face especially, but sometimes arms Individual lesions Macules and patches Course Months or years Differential diagnosis clinic…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Toxic Erythema?

“Toxic erythema: Red or pinkish color of the skin, if localized, probably due to external cause; if generalized, frequently of internal origin such as derangement of the gastrointestinal tract; ingestion of drugs or antitoxin.” Knowles…

Differential Diagnosis in Dermatopathology

Guttate psoriasis vs. Guttate (dermatosis) parapsoriasis

Circular orange-red-blue macule(s) or patch(es) that often becomes a papule(s) or plaque(s) and vesiculates, healing with hyperpigmentation, and that occurs repeatedly at the very same cutaneous and/or mucous membrane site(s), especially the genital…

Differential Diagnosis in Dermatopathology

Discussions

In a collagenous type of connective tissue nevus, known also as collagenoma, and in a lesion late in the course of morphea, abnormalities of connective tissue are observed mostly in the dermis. Bundles of collagen are thickened throughout the reticu…

Histologic Diagnosis of Inflammatory Skin Diseases

Eosinophilic folliculitis

Eosinophilic folliculitis Synonyms Sterile eosinophilic pustulosis Eosinophilic pustular dermatosis Circinate eosinophilic dermatosis Presentation stereotypical Age and sex Infants of both sexes, restricted usually to the scalp; young adults, especi…

Differential Diagnosis in Dermatopathology

Discussions

Early changes in papulonodular lesions of dermatofibromas are similar, in many respects, to those in Kaposi’s sarcoma. Both are dome-shaped and consist of proliferations that are highly cellular. Most of the cells are oval and they are joined…

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