A nurse is assessing a 60-year-old client with psoriasis. Which finding would be most characteristic of this condition?

The most characteristic finding of psoriasis is well-demarcated, raised, erythematous plaques covered with silvery-white scales. This description directly reflects the underlying pathophysiology of the disease. Psoriasis is a chronic, immune-mediated systemic inflammatory condition, where the central pathogenic mechanism involves the interleukin-23/interleukin-17 (IL-23/IL-17) axis ^[3]. In this process, activated T helper 17 (Th17) cells and group 3 innate lymphoid cells (ILC3s) release pro-inflammatory cytokines, primarily IL-17A, IL-17F, and IL-22 ^[3].

These cytokines act on keratinocytes, triggering a cascade that results in epidermal hyperproliferation and the sustained inflammatory microenvironment typical of psoriatic lesions ^[3]. The rapid turnover of skin cells leads to the accumulation of immature keratinocytes on the surface, which clinically manifests as the thick, silvery-white scales. The underlying inflammation causes the dilation of dermal capillaries, producing the raised, erythematous (red) base. The term "well-demarcated" highlights the sharp, distinct border between the affected plaque and the surrounding normal skin, a key feature that helps differentiate it from other dermatological conditions like eczema.

This classic plaque morphology is the hallmark of the most common form of the disease, chronic plaque psoriasis, which affects approximately 1-3% of the global population . The condition is not merely a skin disorder but is perceived as a systemic disease associated with a chronic inflammatory state, often linked to multiple comorbidities .

The other options describe findings characteristic of different dermatological conditions, which is a common testing strategy on the NCLEX-RN.

• Option 2: Fluid-filled vesicles that rupture and form honey-colored crusts. This is the classic presentation of impetigo, a superficial bacterial skin infection, most commonly caused by Staphylococcus aureus or Streptococcus pyogenes. The honey-colored crust is a pathognomonic sign.


• Option 3: Flat, brown patches with irregular borders and varying colors. This description is a red flag for malignant melanoma. The irregular borders and color variation are part of the ABCDE criteria (Asymmetry, Border irregularity, Color variation, Diameter >6mm, Evolving) used for assessing suspicious pigmented lesions.


• Option 4: Small, red, itchy bumps that appear in linear patterns. A linear pattern of pruritic, erythematous papules is highly suggestive of scabies, a skin infestation caused by the mite Sarcoptes scabiei. The linear burrows represent the tracks created by the mite within the stratum corneum.

A thorough integumentary assessment requires the nurse to distinguish between these primary lesion morphologies, as they point to vastly different etiologies, treatment plans, and nursing interventions. In psoriasis, treatment strategies may range from topical anti-inflammatory agents, such as calcipotriol/betamethasone dipropionate combinations, to systemic therapies targeting the IL-23/IL-17 pathway ^[3].