What is a sign of an allergic skin response?

• A. Redness, swelling, and itching
• B. Pustules and blisters
• C. Flaking and peeling
• D. Dark pigmentation and scaling

Answer: (A)

Redness, swelling, and itching are hallmark signs of an allergic skin response. When the body encounters an allergen, the immune system reacts by releasing histamines and other chemicals, which cause blood vessels to dilate and fluid to leak into the surrounding tissues. This results in localized inflammation manifesting as redness and swelling, while the irritation from the histamine can also lead to intense itching.

In contrast, pustules and blisters typically indicate a different type of skin reaction, often associated with infections or other dermatological conditions rather than a straightforward allergic response. Flaking and peeling often occur due to dry skin or conditions like eczema or psoriasis, which may not necessarily be linked to an allergy. Similarly, dark pigmentation and scaling are more characteristic of chronic conditions like lichen planus or post-inflammatory hyperpigmentation rather than acute allergic reactions. Thus, the signs of redness, swelling, and itching distinctly point towards an acute allergic skin response.