Presents as intensely pruritic, coin-shaped, weeping, or crusted plaques, a more inflammatory presentation than parapsoriasis.
Typically more acute in onset, pruritic, and resolves upon discontinuation of the offending drug.
Can be indistinguishable in early stages, but progression to thicker plaques, tumors, or irregularly shaped patches suggests mycosis fungoides, confirmed by biopsy.
Presents with crops of reddish-brown papules that develop a fine, 'mica-like' adherent scale, a different morphology than the patches of parapsoriasis.
Characterized by a 'herald patch' followed by an eruption of oval plaques in a 'Christmas tree' distribution that resolves spontaneously in 6-8 weeks.
Guttate psoriasis can have small lesions, but they are typically drop-like, erythematous papules with a silvery scale, not the fine, yellowish patches of parapsoriasis.
The papulosquamous eruption typically involves the palms and soles and is associated with other signs of syphilis and positive serology.
