Differential Diagnosis > Morphology > Reaction Patterns > Papulosquamous

Papulosquamous

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papulosquamous ddx:

•Pityriasiform - PR, secondary syphilis, EAC, parapsoriasis
•pemphigus foliaceous
•subacute eczematous
•crusted scabies
•lichen planus
•SCLE
•expanded (rare) - glucagonoma syndrome/acrodermatitis enteropathica, erythrokeratoderma variabilis, Netherton’s syndrome
•psoriasiform…

 

Psoriasiform ddx:

•psoriasiform histology – psoriasis, PRP, ILVEN, lichen striatus
•photodistributed – SCLE
•generalized – guttate psoriasis, secondary syphilis, PRP, crusted scabies
•psoriasis variants – Reiter’s disease, AGEP
•solitary lesion – atypical mycobacteria/deep fungal, ILVEN