Papulosquamous disorders and Psoriasis(Part-1)
A papulosquamous disorder is a condition which presents with both papules and scales,or both scaly papules and plaques.
Examples include psoriasis, lichen planus,[and pityriasis rosea.
Psoriasis
1.Well defined
2. Erythematous (salmon pink color)
3.Indurated
4.Scaly: large silvery loose scales; minimal in flexures and on glans
5.Symmetric generally
6.Extensors, scalp, lumbosacral area most common
7.Pruritic
8.Hypo pigmented halo: Woronoff ring (due to vasoconstriction due to PGE2, hence not accentuated on wood’s lamp)