A Clinical Atlas of 101 Common Skin Diseases

Deep Fungal Infections

Cutaneous and subcutaneous lesions, usually nodules, that have become keratotic, crusted, and ulcerated as a consequence of infection by a variety of deep fungi, i.e., fungi situated in the dermis and subcutis, some of which may be disseminated to o…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…lasma cells, and brown spores in a multinucleate macrophage = Chromomycosis In a fully developed lesion of chromomycosis, such as the one shown, organisms are present in histiocytes, especially multinucleate ones. At an earlier stage, however, organ…

Dermatology Practical & Conceptual

Multiple confluent reddish nodules

The patient A 48-year-old fisherman from Amazonas (north of Brazil) developed a small papule on the anterior left leg after a traumatic injury with a piece of wood 20 years ago. Over the course of years, multiple large, confluent, reddish to brownis…

Histologic Diagnosis of Inflammatory Skin Diseases

Pheohyphomycosis

Pheohyphomycosis Synonyms Phaeomycotic cyst Subcutaneous pheaohyphomycosis Presentation stereotypical Age and sex No predilection for age or sex, but more common in individuals who reside in the tropics; most of those persons not immunocompromised…

Histologic Diagnosis of Inflammatory Skin Diseases

Atypical mycobacterial infections

Atypical mycobacterial infections Presentation stereotypical Age and sex Any age, but more often in young adults, particularly men and those who are immunocompromised Distribution of lesions Localized to a circumscribed site, that being the one of i…

Histologic Diagnosis of Inflammatory Skin Diseases

Deep fungal infections

Deep fungal infections Synonyms Mycetoma Subcutaneous mycoses Dermal mycoses Presentation stereotypical Age and sex Any age, both sexes Distribution of lesions Localized or widespread; some infections favor exposed sites; internal organs sometimes…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Perforating Diseases?

“Perforating dermatoses: . . . various cutaneous disorders are discussed in which the process of perforation and elimination of various tissue components plays a major role in the basic pathologic mechanism. These include perforating granulom…

Histologic Diagnosis of Inflammatory Skin Diseases

Applicable Terms

ABSCESS [L. abscessus (a going away)]: Clinically, a circumscribed collection of pus and histopathologically a localized collection of neutrophils. An abscess may form in the epidermis, both surface and infundibular, eccrine ducts, dermis, and subcu…