Psoriasiform Dermatoses

■ Reiters Disease

■ Pityriasis Rubra Pilaris

■ Inflammatory Linear Verrucous Epidermal Nevus

Spongiotic Dermatoses

■ Allergic Contact Dermatitis

This chapter covers the psoriasiform and spongiotic dermatoses. This group of disorders is among the most common "rashes" seen in the offices of pediatric, family practice, and internal medicine physicians, as well as dermatologists. Clinically, the lesions appear elevated or raised (papular) and scaly (squamous) and are sometimes referred to as papulosquamous eruptions. The spongiotic group includes variable clinical presentations with the common histopathologic finding of spongiosis.


■ Acanthosis: A histopathologic term describing thickening of the epidermis; may be regular or irregular.

■ Parakeratosis: A histopathologic term describing the retention of nuclei within the stratum corneum.

■ Periodic acid Schiff (PAS)/Grocott methenamine silver (GMS): Special stains to identify fungal organisms.

■ Psoriasiform: A histopathologic term describing uniform, regular thickening of the epidermis as seen in classic psoriasis; regular acanthosis.

■ Spongiosis: A histopathologic term describing the separation of individual epidermal keratinocytes by intercellular edema.

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