Lesions on the mucous membranes may be more difficult to diagnose than lesions on the skin, and not merely because they are less easily and less often seen. There is…

Collagen Many types of collagen have been identified in tissues of vertebrates ( Table 25.1 ). Collagens help form the support structure and scaffolding for many parts of the body,…

Dermatologists have been leaders in the field of cosmetic surgery. Many procedures, products, and technologies in esthetic dermatologic surgery have been developed and researched by dermatologists. In addition, patients are…

A nutritional disease is caused either by insufficiency or, less often, by excess of one or more dietary essentials. Nutritional deficiencies are particularly common in developing countries but can also…

The skin interacts with the endocrine system in many ways. Some of these are discussed in this chapter. Leventhal JS, et al: Skin manifestations of endocrine and neuroendocrine tumors. Semin Oncol…

An inflammatory disorder that is primarily localized in the subcutaneous fat is termed a panniculitis. This group of disorders may be challenging for both the clinician and the dermatopathologist. Clinically,…

Cutaneous laser surgery is a continually evolving area of dermatology. Development of new lasers, as well as improvements in existing lasers, continues to advance the field. As a result of…

Bacterial infections in the skin often have distinct morphologic characteristics that should alert the clinician that a potentially treatable and reversible condition exists. These cutaneous signs may be an indication…

Epidemiology The World Health Organization (WHO) has committed itself to eliminating Hansen disease as a public health problem, but the disease remains endemic in certain regions, with 95% of cases…

Superficial and Deep Mycoses Fungal infections, including dermatophytes and candida, are the most common type of infection worldwide. Cutaneous infections are divided into superficial (those that affect mostly the skin)…