Papulosquamous Skin Rash - Differential Diagnosis Algorithm
Erythrematous ...
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Papulosquamous Skin Rash - Differential Diagnosis Algorithm

Erythrematous or violaceous papules & plaques with overlying scale

 • Psoriasis - Well demarcated plaques, thick silvery scale on elbows & knees. Auspitz sign, Koebner's phenomenon

 • Lichen Planus - Purple, pruritic, polygonal, planar (flat-topped) papules on wrists/ankles/genitals (especially penis) Wickham's striae, Koebner's phenomenon

 • Pityriasis Rosea - Oval, tannish-pink or salmon-coloured patches, plaques with scaling border in Christmas tree pattern on trunk, begins with a large lesion patch Herald's atch

 • Tinea (Ring Worm) - Annular (Ring- shaped) lesion with elevated scaling, red border, central clearing

 • Secondary Syphilis - Red brown or copper coloured scaling papules and plaques on palms and soles

 • Discoid Lupus Erythematous - Scarring and/or atrophic red/purple plaques with white adherent scales on sun-exposed area



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