Dermatology Practical & Conceptual

Inguinal porokeratosis in a Japanese man

Abstract Inguinal and genital porokeratosis is rare but seems to be more common in Asians. We report a case of a 69-year-old Japanese man with multiple lesions of porokeratosis in both inguinal regions. The lesions first appeared in the inguinal reg…

Histologic Diagnosis of Inflammatory Skin Diseases


Dermatomyositis Presentation stereotypical Age and sex Children or adults; in adults, tending to occur more commonly in women in their fifth or sixth decade Distribution of lesions Widespread, at first on the eyelids, then the entire face, eventuall…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology


“Atrophoderma, or atrophia cutis. Atrophy of the skin may be quantitative or qualitative; idiopathic or symptomatic; diffused or circumscribed. Crocker gives this useful table: Pigmentosum Juvenilis Albidum Diffusum Senilis…

Histologic Diagnosis of Inflammatory Skin Diseases

Definition of Inflammation in Historical Perspective

…until 1859, however, that Rudolf Virchow, in his classic work, Cellularpathologie, advised that “inflammation is the most common pathologic process in tissue caused by a stimulus that evokes changes in cellular parts of the tissue, which might…

Histologic Diagnosis of Inflammatory Skin Diseases


Images 10.2.1A: Perivascular dermatitis, spongiotic and slightly psoriasiform + 10.2.1B: Slight edema of the papillary dermis and scale-crust = Nummular dermatitis  Changes such as these are indistinguishable from those of allergic contac…

Dermatology Practical & Conceptual

Patient Handouts

Educate your patients with our downloadable patient handouts  Choosing A Sunscreen (31 KB)  How to use Topical Retinoid Medications (30 KB)  Skin & Hair Care for Acne Patients (30 KB)  Skin Care after Treatment of Actinic Keratosis (95 KB)  Sk…

Histologic Diagnosis of Inflammatory Skin Diseases

Atopic dermatitis

Atopic dermatitis Synonyms Neurodermatitis Atopic eczema Presentation stereotypical Age and sex All ages and both sexes; in infants, children, and young adults who are atopic and in whom the signs of rubbing and scratching tend to be distributed on…

Differential Diagnosis in Dermatopathology

Papular mucinosis vs Interstitial granuloma annulare

An inflammatory process that results from either topical or systemic sensitization coupled with the effects of ultraviolet light. The lesions, all of which occur in photodistribution, are macules, papules, and blisters that resolve with crusts….

Differential Diagnosis in Dermatopathology


…ral findings histopathologic in common, among them mesenchymal cells with abundant pink cytoplasm scattered among bundles of collagen, multinucleate cells in sections of tissue of some specimens, deposits of mucin in company with an increased number…