Psoriasis and Pruritus: Clinical Significance and Management

Clinical Presentation and Assessment

The American Academy of Dermatology recommends that an itch severity assessment be performed for patients whose psoriasis causes significant pruritus 1
Psoriasis classically presents with well-demarcated, erythematous plaques with silvery scale, commonly involving the scalp, elbows, knees, and presacral region 2
The most commonly used tools for assessing pruritus intensity are the visual analog scale (VAS) and numeric rating scale (NRS) 1
A change of 3-4 points on these scales is considered clinically significant 1

Different clinical phenotypes of psoriasis may present with varying degrees of pruritus 3
Plaque psoriasis (psoriasis vulgaris) is the most common form and is frequently associated with pruritus 3
Inverse psoriasis, which affects intertriginous areas, may present with erythematous plaques with minimal scale due to the moist nature of these areas 3
Erythrodermic psoriasis, a severe form, can present with generalized erythema and varying degrees of scaling 3
Pustular psoriasis is characterized by collections of neutrophils large enough to be clinically apparent 3
Guttate psoriasis presents with small, salmon-pink papules with fine scale, primarily on the trunk and proximal extremities 3

Environmental factors such as stress, systemic infections, and certain medications can trigger exacerbations of psoriasis and potentially worsen pruritus 4

The presence of significant pruritus in psoriasis should be recognized as an important symptom that requires appropriate assessment and management 1
Treatment decisions should consider not only the extent of skin involvement but also the impact of symptoms like pruritus on quality of life 5