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==Histologic DDx== | ==Histologic DDx== | ||
*PRP is easy to miss - clinical history (r/o PRP) usually | *PRP is easy to miss - clinical history (r/o PRP) usually needed to prompt correct diagnosis. | ||
*Psoriasis vulgaris | *Psoriasis vulgaris <ref name=pmid18418089>{{Cite journal | last1 = Brinster | first1 = NK. | title = Dermatopathology for the surgical pathologist: a pattern based approach to the diagnosis of inflammatory skin disorders (part I). | journal = Adv Anat Pathol | volume = 15 | issue = 2 | pages = 76-96 | month = Mar | year = 2008 | doi = 10.1097/PAP.0b013e3181664e8d | PMID = 18418089 }}</ref> - thinned suprapapillary plates, hypogranulosis, neutrophils in the stratum corneum, dilated papillary dermal blood vessels, acantholysis absent | ||
*Lichen simplex chronicus. | *Lichen simplex chronicus - usually a localized process, not a widespread process. | ||
*Darier disease - acantholysis is prominent with corps ronds and grains, follicular plugging absent | *Darier disease - acantholysis is prominent with corps ronds and grains, follicular plugging absent | ||
*Seborrhoeic dermatitis - more spongiotic, often with neutrophils. | *Seborrhoeic dermatitis - more spongiotic, often with neutrophils. |
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