Discolorations of the skin include disorders of hypopigmentation (lightening), disorders of hyperpigmentation (darkening), and disorders caused by abnormal deposition of any pigment that alters skin color. The abnormal pigmentation can…
Numerous arthropods can produce infestations, stings, and bites (see box). In addition to infestations, like scabies, arthropods can produce pruritic bites and local envenomation reactions that can result in tissue…
Key Terms Paronychia Acute paronychia Chronic paronychia Onychomycosis Leukonychia mycotica Onychauxis Thick hyperkeratotic nails Trachyonychia Twenty-nail dystrophy Nail disorders are often encountered as “Oh, by the way…” issues, meaning that…
Key Terms Scleroderma Progressive systemic sclerosis Scleredema Scleredema adultorum Scleredema of Buschke Sclerosing and fibrosing disorders manifest as a hardening or induration of the skin due to the overproduction (fibrosis)…
Follicular disorders represent pathologic processes that alter or otherwise inflame the pilosebaceous (follicular) unit. Alopecias are also follicular disorders but are considered elsewhere in this text. Numerous disorders can affect…
Purpuric and hemorrhagic (P&H) disorders may be caused by systemic illness, potentially fatal infections (e.g. meningococcemia), coagulopathies, vascular occlusive disorders (e.g. cryoglobulinemia), and inflammatory disorders of blood vessels (e.g. vasculitis)….
Key Terms Striae Stretch marks Striae alba Striae distensae Striae gravidarum Striae rubra Atrophic Disorders Partial Differential Diagnosis • Acrodermatitis chronica atrophicans • Anetoderma • Aging—extrinsic (photoaging) • Aging—intrinsic •…
Key Terms Acrodermatitis continua of Hallopeau Impetigo herpetiformis Pustulosis of the palms and soles Pustules are defined as papular lesions filled with an exudate of acute inflammatory cells. In most…
A recent study found that skin disease affects up to 8% of travelers. Skin disease is the third most common problem of travelers, after diarrhea and respiratory disorders. It is…
