How is classification of psoriasis based on morphology?

Plaque (scaly, very well demarcated, round, erythematous papule, surface is white greyish thick or may be stripped by the tx revealing the underlying rash, Multiple symmetrical bilateral diffuse sometimes, affect 80-90% of the pts, may have auspitz sign [bleed after removal] or koebner [induced by trauma]) Inverse (erythematous patches located in skin folds, felxural disribution, lack scale) Guttate (due drop like lesions 1-10 mm salmon pink papules w/fine scales can be triggered by strep pharyngitis managed by Abx, ATB, topical tx, Band UVB) erythrodermic (generalized erythema covering entire body surface area w/varying degree of scaling) Pustular (clinically apparent pustules, generalized Von Zumbusch variant, localised palms and soles)