How does psoriasis affect the skin?

• A. It causes skin to become oily and shiny.
• B. It leads to red, scaly patches on the skin.
• C. It results in dry, cracked skin.
• D. It causes pigmentation changes in the skin.

Answer: (B)

Psoriasis is a chronic autoimmune condition that primarily affects the skin, leading to the formation of red, scaly patches known as plaques. These plaques are typically raised and can be covered with silvery-white scales, resulting from the rapid turnover of skin cells. In psoriasis, the immune system triggers an overproduction of skin cells, which do not have sufficient time to shed, leading to the accumulation of these cells on the skin's surface. This process is responsible for the characteristic appearance of red, inflamed areas covered with scales that are often itchy and can sometimes crack or bleed.

The other options presented do not accurately describe how psoriasis affects the skin. For instance, while psoriasis involves inflammation and might lead to certain dryness, it does not primarily cause the skin to appear oily and shiny. Additionally, while dry and cracked skin can occur as a secondary issue due to scratching or irritation, it is not the defining feature of psoriasis itself. Pigmentation changes may occur in various skin conditions, but psoriasis is specifically recognized for its distinct red and scaly patches rather than pigmentation alterations. Thus, the description of psoriasis causing red, scaly patches is the most accurate representation of its effect on the skin.