Which of the following skin features is commonly observed in psoriasis that aids in its diagnosis?

Explanation: The primary etiological factor in psoriasis is a genetic predisposition. Psoriasis has a strong hereditary component, and individuals with a family history of the condition are at a higher risk of developing it. While environmental triggers can exacerbate psoriasis symptoms, the condition itself is primarily influenced by genetic factors.

Incorrect choices: a. Bacterial infection: Psoriasis is not caused by a bacterial infection. It is an autoimmune condition characterized by an overactive immune response, leading to inflammation and skin cell overproduction.

b. Fungal overgrowth: Fungal overgrowth is not a cause of psoriasis. Psoriasis is not related to fungal infections and has a different underlying mechanism.

d. Allergic reaction: While certain allergens may exacerbate psoriasis symptoms in some individuals, an allergic reaction is not the primary cause of psoriasis. The condition's pathophysiology is rooted in immune system dysfunction rather than allergic responses.

Explanation: The primary assessment technique used to diagnose psoriasis is a physical examination of the skin. The characteristic red, raised patches with silver scales are indicative of psoriasis. While additional tests like skin biopsy may be used to confirm the diagnosis, the initial diagnosis is based on the visual appearance of the skin lesions.

Incorrect choices: a. A skin biopsy may be performed to confirm the diagnosis of psoriasis, but it is not the primary assessment technique used to diagnose the condition.

b. Blood tests may be conducted to rule out other conditions or assess for systemic involvement, but they are not the primary method of diagnosing psoriasis.

d. MRI is not a diagnostic tool for psoriasis. It may be used in certain cases to assess joint involvement in psoriatic arthritis, but it does not diagnose psoriasis itself.