<prompt> Which of the following features are associated with psoriasis: September 2009Munros micro-abscesses, fir tree appearence and epidermal hyperplasiaMunros micro-abscesses, parakeratosis, and epidermal hyperplasiaMunros micro-abscesses, satellite pustules and epidermal hyperplasiaMunros micro-abscesses, wickhams striae and epidermal hyperplasia  <response>: Ans. B: Munros micro-abscesses, parakeratosis, and epidermal hyperplasia Psoriasis is a common, relapsing chronic inflammatory condition affecting about 1.5-3 of the worlds population, causing significant morbidity. The presence of a well-defined margin and a silvery white scale, over a glossy homogenous membrane, is clinically diagnostic of psoriasis. The successive removal of the psoriatic scales usually reveals an underlying, smooth, glossy red membrane with multiple bleeding points where thin suprapapillary epithelium is torn off Auspitzs sign. When the scaling is not evident, it can be induced by light tangential scratching with the edge of glass slide Grattage. Psoriasis often involves nails, scalp, mucosae, and joints, as well. Parakeratosis nuclei retained in the horny layer, dilated blood vessels, regular epidermal hyperplasia regular acanthosis, and presence of Munro microabscess andor Kogojs abscess have been described to be the most constant or characteristic histopathological features in skin biospy of psoriasis. Similarly, spongiosis, irregular epidermal hyperplasia, and absence of Munro micro and Kogojs abscess have been found consistently in psoriasiform dermatitis Moreover, the diagnostic histopathological findings of psoriasis, namely, Kogojs spongiform pustules and Munro microabscess, can also be seen in dermatophytoses, candida infection, and others. 