Which of the following diagnostic tests is commonly performed to confirm the diagnosis of psoriasis?

Explanation: Psoriasis is not contagious and cannot be spread through direct contact with affected individuals. It is an autoimmune disease where the immune system mistakenly attacks healthy skin cells, leading to the characteristic red, scaly patches on the skin.

Incorrect choices: a. This statement is correct. Psoriasis is a chronic skin condition that causes red, scaly patches on the skin.

b. This statement is correct. Psoriasis is indeed an autoimmune disease where the body's immune system attacks healthy skin cells.

d. This statement is correct. Treatment for psoriasis aims to reduce inflammation and slow down the rapid skin cell growth to manage the symptoms of the condition.

Explanation: Psoriasis is characterized by the presence of itchy, raised, red patches on the skin with silvery scales. These patches are known as plaques and are a hallmark feature of psoriasis.

Incorrect choices: a. Painful, deep ulcers on the skin: This description does not align with psoriasis. Psoriasis plaques are not typically painful or ulcerated.

c. Small, fluid-filled blisters on the palms and soles: This description is more characteristic of a condition called palmoplantar pustulosis, not psoriasis.

d. Thickened, hardened skin with deep cracks: This description is more typical of a condition called lichenified eczema or chronic contact dermatitis, not psoriasis.