1 2 3 7
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…

A Clinical Atlas of 101 Common Skin Diseases

Tuberculosis

An inflammatory process caused by Mycobacterium tuberculosis. In the skin, it may be primary as a consequence of direct inoculation (tuberculosis verrucosa cutis) or secondary to a focus of tuberculosis in another organ (the lung for lupus vulgaris,…

A Clinical Atlas of 101 Common Skin Diseases

Acne Vulgaris

A disease of infundibulosebaceous units, especially infundibula, that may manifest itself solely as noninflammatory lesions, i.e., comedones and intact cysts, or as inflammatory lesions, i.e., papules, nodules, and pustules. The process may resolve…

A Clinical Atlas of 101 Common Skin Diseases

Nodular Vasculitis

An arteritis in the subcutaneous fat manifested clinically at first by one or more red nodules that, in time, become ulcerated and heal with scars, usually on the posterior aspect of the legs of short, thick-legged women. No cause is usually found,…

A Clinical Atlas of 101 Common Skin Diseases

Pyoderma Gangrenosum

An inflammatory process that often begins as a suppurative folliculitis manifested clinically as pustules. It rapidly extends to become ulcers marked at their periphery by boggy tissue. The skin disease is associated commonly with inflammatory bowel…

A Clinical Atlas of 101 Common Skin Diseases

Atypical Mycobacterial Infections

Infection of skin and subcutaneous tissue by atypical mycobacteria, that is, mycobacteria other than those responsible for tuberculosis and leprosy, expressed clinically as keratotic and crusted papules, plaques, nodules, and tumors that may be punc…

Histologic Diagnosis of Inflammatory Skin Diseases

Atypical mycobacterial infections

…perficial and deep perivascular mixed-cell infiltrate Foci of suppuration in the dermis and often in infundibula Fully developed Suppuration in the dermis and sometimes in lobules in the subcutaneous fat Necrosis of adipocytes in lobules varies fro…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…37.1B: Numerous Demodex folliculorum and squames in a zone of suppuration = Suppurative infundibulitis of unknown cause Demodex, Pityrosporum, bacteria, sebum, squames, and cornified cells, as well as neutrophils of a suppurative infundibulitis are s…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Pustular Dermatitis

…sses itself clinically as a pustule, then it is the result of suppuration so exuberant that it has extended, by continuity, from infundibular epidermis into follicular epithelium, that situation occurring often during the exudative stage of Majocchi&…

Histologic Diagnosis of Inflammatory Skin Diseases

Nodular vasculitis

…n a septum in the subcutaneous fat Necrosis of adipocytes and suppuration in lobules in the subcutaneous fat Fully developed Artery in a septum in the subcutaneous fat obscured by a dense mixed-cell infiltrate that consists mostly of neutrophils, b…

1 2 3 7