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There are many conditions that can have truncal involvement. This section focuses on some common eruptions that frequently affect the trunk: papulosquamous disorders; urticarial and morbilliform disorders; blistering disorders; and miscellaneous disorders. Urticaria and angioedema are discussed in chapter 14, "Anaphylaxis, Allergies, and Angioedema." Although the truncal location of an eruption can be a helpful clue for diagnosis, the clinical appearance of the lesions and overall assessment of the patient are needed to make the correct diagnosis.


Scaling conditions include psoriasis, seborrheic dermatitis, tinea corporis, pityriasis ("tinea") versicolor, eczema/atopic dermatitis, lichen planus, secondary syphilis, and scabies. Table 251-1 lists common features distinguishing these eruptions.

TABLE 251-1Comparison Features of Common Papulosquamous Eruptions


Psoriasis is discussed in detail in chapter 253, "Skin Disorders: Extremities." Stress or alcohol ingestion can be associated with a flare of psoriasis. The following medications can also be related to an exacerbation: steroid withdrawal, lithium, β-blockers, interferon, and antimalarials.1 The differential diagnosis is listed in Table 251-1.

Diagnosis is clinical. The disorder is ...

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