What is the primary factor contributing to the development of psoriasis?

Explanation: The presence of at least 3 typical psoriasis plaques on the body is one of the essential diagnostic criteria for confirming psoriasis. These plaques are characterized by well-defined, erythematous (red), raised lesions with silvery-white scales.

Incorrect choices: a. Positive skin biopsy showing eosinophils infiltration: While a skin biopsy may be performed to support the diagnosis of psoriasis, the presence of eosinophils is not specific to psoriasis and can be found in various skin conditions.

b. Family history of autoimmune diseases: A family history of autoimmune diseases may increase the risk of developing psoriasis, but it is not a definitive diagnostic criterion for the condition.

d. Elevated erythrocyte sedimentation rate (ESR) on blood test: An elevated ESR can indicate inflammation in the body, but it is not specific to psoriasis and may be present in other inflammatory conditions as well.

Explanation: Applying topical corticosteroids to affected areas can help reduce inflammation, itching, and discomfort associated with psoriasis. However, the nurse should ensure that the patient follows the prescribed dosage and instructions for the use of corticosteroids.

Incorrect choices: b. Encouraging the patient to scratch the affected areas gently is not appropriate, as scratching can exacerbate psoriasis and lead to skin damage and infection.

c. NSAIDs are not typically used to manage itching and discomfort in psoriasis. They may be prescribed for joint pain associated with psoriatic arthritis, but they do not target the skin symptoms of psoriasis.

d. While warm baths can be soothing, frequent baths may actually dry out the skin and worsen psoriasis. Additionally, the water should be lukewarm rather than hot to avoid triggering flare-ups.