Which of the following skin changes is a hallmark of chronic psoriasis?

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: Taking long, hot baths can actually worsen psoriasis by drying out the skin and triggering flare-ups. Instead, patients with psoriasis should take short, lukewarm baths or showers to avoid exacerbating the condition.

Incorrect choices: a. Moisturizing the skin regularly is an essential part of psoriasis management to prevent dryness and scaling.

b. Avoiding fragranced soaps and lotions can help minimize skin irritation and sensitivity, which is beneficial for patients with psoriasis.

c. Applying sunscreen before going outside is important, as exposure to UV rays can trigger or worsen psoriasis. Sun protection helps prevent further skin damage.