■ Pruritic Urticarial Papules and Plaques of Pregnancy
■ Erythema Migrans
■ Persistent Pigmented Purpuric Dermatitis
■ Viral Exanthems
■ Polymorphous Light Eruption
■ Tumid Lupus Erythematosus
■ Erythema Figuratum
■ Postinflammatory Pigmentary Alteration
This chapter covers diseases that consist of perivascular (and interstitial) infiltrates of inflammatory cells devoid of marked changes in the epidermis. Clinically, these diseases usually present with smooth surfaced macules, patches, papules, and plaques without either the crust, scale, or both. Some of the diseases in this chapter are characterized by infiltrates that include neutrophils (urticaria, erysipelas), others by infiltrates that typically show numerous eosinophils (pruritic urticarial papules and plaques of pregnancy), or plasma cells (erythema migrans), or by infiltrates that are virtually monopolized by lymphocytes (persistent pigmented purpu-ric dermatitis, viral exanthems, polymorphous light eruption, tumid lupus erythematosus, pernio, erythema figuratum); still others are typified by sparse infiltrates of inflammatory cells accompanied by very subtle, but highly characteristic changes in epidermis or dermis (postinflammatory pigmentary alteration, vitiligo, tinea versicolor, erythrasma).
It should be mentioned that many diseases dealt with in separate chapters of this book may present themselves also as perivascular dermatitis devoid of marked changes in the epidermis at an early or resolving stage. Among those are bullous diseases (e.g., bullous pemphigoid) and vasculitides (e.g., leukocytoclastic vasculitis).
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