<prompt> Most impoant feature of psoriasis?CrustingScalingOozingErythema  <response>: Psoriasis Papulosquamous disease Common inflammatory scaling dermatosis well-demarcated erythematous plaques surmounted by characteristic silvery white scaling with a BL symmetric distribution is associated with seronegative spondyloahropathy. Scaling Conditions Psoriasis Atopic Dermatitis Contact Dermatitis Lichen Simplex Chronicus Lichen Planus 