**Question:** Characteristic lesion in scabies is

A. Papular urticaria
B. Eczema
C. Lichenification
D. Erythema migrans

**Core Concept:**
Scabies is a skin infection caused by the mite Sarcoptes scabiei, primarily affecting humans. These mites burrow into the skin, leading to an immune response and characteristic skin lesions.

**Why the Correct Answer is Right:**
The correct answer, **C. Lichenification**, represents a thickening and induration of the skin due to chronic rubbing and scratching caused by the itching sensation associated with scabies infestation. This is a common feature in the early stages of scabies.

**Why Each Wrong Option is Incorrect:**

A. **Papular urticaria (A):** This is a type of skin reaction characterized by small, transient, and non-pruritic urticarial lesions. It is not a characteristic feature of scabies.

B. **Eczema (B):** Eczema refers to a group of skin conditions characterized by inflammation and dryness, which is distinct from the typical pruritic (itchy) lesions seen in scabies.

D. **Erythema migrans (D):** This is a characteristic feature of Lyme disease caused by the bacterium Borrelia burgdorferi, not scabies.

**Clinical Pearl:**
In clinical practice, recognizing the characteristic skin lesions of scabies is crucial for prompt diagnosis and appropriate management. Scabies is often misdiagnosed as eczema or papular urticaria, leading to unnecessary treatments and delay in appropriate care.

Scabies lesions typically manifest as pruritic (itchy) macules (small, flat) and papules (small, elevated) on the skin. They may evolve into papules with central clearing and are surrounded by a halo of urticaria (red, raised areas). The itching sensation is usually the most prominent symptom that leads to the patient seeking medical attention.