Info

Pityriasis Rubra Pilaris

Pityriasis Rosea

Epidermal acanthosis

Yes regular mild

No mild

Parakeratosis

alternating orthokeratosis and parakeratosis "checkerboard"

very focal

Loss of granular layer

Yes focal

No very focal

Neutrophils in epidermis

No

No

Parakeratosis with admixed neutrophils

No

No

Spongiosis

No

Yes mild

Clear/pale epidermal keratinocytes

No

No

Periodic acid Schiff/Grocott methenamine silver stain

Negative

Negative

Table 2A Histologic Differential Diagnosis: Inflammatory Linear Verrucous Epidermal Nevus

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