Histologic Diagnosis of Inflammatory Skin Diseases

Impetigo contagiosa

Impetigo contagiosa Synonyms Impetigo Presentation stereotypical Age and sex Children, particularly of preschool age, but young adults of either sex may be affected Distribution of lesions Exposed parts of the body, especially the face, hands, neck,…

Histologic Diagnosis of Inflammatory Skin Diseases

Lichen striatus

…e papillary dermis Focal spongiosis Focal parakeratosis and/or scale-crusts Late All the changes enumerated for fully developed lesions except scale-crusts and with the addition of hints of granulomatous inflammation in the papillary dermis and eve…

Histologic Diagnosis of Inflammatory Skin Diseases

Photoallergic dermatitis

…pongiotic vesicles Cornified layer either normal or covered by scale-crusts Late Superficial or superficial and deep perivascular and interstitial infiltrate of lymphocytes mostly Uneven psoriasiform acanthosis Slight focal spongiosis Scale-crusts…

Dermatology Practical & Conceptual

A keratoacanthoma with venous invasion

Abstract Keratoacanthomas are variously regarded as a self-limiting variant of squamous cell carcinoma or as a distinct benign lesion and they very seldom show attributes normally associated with malignant behaviour, such as perineural invasion. Her…

Histologic Diagnosis of Inflammatory Skin Diseases

Pellagra

…lar edema in spinous cells in the upper half of the epidermis. Scale consists of parakeratosis and scale-crust of parakeratosis, serum, and, sometimes, neutrophils. Differential diagnosis histopathologic Acrodermatitis enteropathica, necrolytic migr…

Histologic Diagnosis of Inflammatory Skin Diseases

Pruritic urticarial papules and plaques of pregnancy

Pruritic urticarial papules and plaques of pregnancy Synonyms Polymorphic eruption of pregnancy Bourne’s toxemic rash of pregnancy Toxemic rash of pregnancy Toxic erythema of pregnancy Nurse’s late onset prurigo of pregnancy Presentati…

Histologic Diagnosis of Inflammatory Skin Diseases

Arthropod assaults

Arthropod assaults Synonyms Insect “bite” Bug bite Insect bite reaction Papular urticaria Lichen urticatus Strophulus Presentation stereotypical Age and sex Any age and both sexes Distribution of lesions At times only a single lesion a…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Figurate Erythemas?

“Erythema in Patches and Figured Erythema—These consist of congestive spots, patches, or surfaces of irregular shape, discoidal or of variable configuration (erythema marginatum or annulare, etc.). Although sometimes infectious, this t…

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…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.18.1A: Perivascular dermatitis, slightly psoriasiform + 10.18.1B: Mixed-cell infiltrate with pallor in the upper part of the viable epidermis in company with scale-crust = Necrolytic migratory erythema Findings identical with th…