What chronic condition involves the immune system attacking cells responsible for pigmentation?

• A. Psoriasis
• B. Vitiligo
• C. Eczema
• D. Rosacea

Answer: (B)

Vitiligo is a chronic condition that occurs when the immune system mistakenly attacks and destroys the melanocytes, the cells responsible for producing skin pigment (melanin). This results in the loss of color in patches of skin, leading to distinct areas of lighter skin compared to the surrounding area. Understanding this mechanism is crucial in recognizing that vitiligo is not merely a cosmetic issue, but rather an autoimmune condition where the body’s immune response targets its own tissues. The other conditions listed, while they may involve skin manifestations, do not involve the immune system attacking pigmentation-producing cells in the same manner. For example, psoriasis is characterized by rapid skin cell turnover leading to red, scaly patches, rather than pigment loss. Eczema primarily presents as inflamed, itchy skin, and rosacea involves flushing and redness but also does not affect pigmentation directly. Thus, the specific focus on the immune system's role in attacking melanocytes is what clearly identifies vitiligo as the correct answer.