Pigmentary disorders of the skin may present with depigmentation, hypopigmentation, or hyperpigmentation. The color, morphology, and distribution of the lesions help to suggest the correct diagnosis. Vitiligo may be segmental…
Bites and infestations present with wide-ranging manifestations, including papules, vesicles, excoriations, and urticarial lesions. Bedbug bites often involve the arms and develop clinical features of prurigo nodularis. A biopsy will…
Fungi and yeasts can cause both superficial and deep infections in the skin with a great variation in clinical findings. In healthy hosts, commensal organisms such as candida remain superficial,…
Endocrine disorders present with a range of findings that may affect any layer of the skin. The associated skin changes can lead the astute physician to suspect the underlying disorder…
This chapter includes a variety of conditions, all resulting from either inherited or acquired changes in the collagen or elastic tissue of the skin. Some inherited syndromes with particularly unique…
Bacterial infections create a multitude of skin lesions, from pustules, to necrotic nodules, to ulcers. These infections range from the superficial crusted erosions of impetigo to the systemic purpuric plaques…
Lichen planus (LP) and other lichenoid eruptions tend to create characteristic primary lesions and patterns. The pruritic, purple, polygonal, flat-topped papules of LP can appear unmistakably shiny as they reflect…
Contact dermatitis and cutaneous drug eruptions are both skin conditions triggered by external agents that are either in direct contact with the skin or ingested. Contact dermatitis shares many features…
Cutaneous manifestations of connective tissue diseases are important to identify because they can be a clue to an undiagnosed systemic autoimmune disease. Many lesions, such as those seen in systemic…
A deficiency or excess of certain required vitamins or minerals can cause specific findings in the skin, hair, nails, and mucosae. This chapter provides images of many of these findings,…
