Info

Dermatitis

Pityriasis Rosea

Dermatitis

Dermatophyte

Parakeratosis

Focal to diffuse

Small focal mounds

Perifollicular

Mild

Acanthosis

Mild

Mild

Mild

Mild

Spongiosis

Mild

Mild focal

Mild

Mild

Extravasated red blood cells

No

Yes

No

No

Eosinophils

Yes

No

No

Sometimes

Periodic acid Schiff

Negative

Negative

Often positive (pityrosporum)

Positive (hyphae)

Figure 9 Subacute spongiotic histology.

Figure 10 (A) Pityriasis rosea, Herald patch (B) Pityriasis rosea.

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