## **Core Concept**
The question tests understanding of atopic dermatitis (eczema) and its association with other atopic diseases. Atopic dermatitis is a chronic inflammatory skin condition characterized by dry, itchy skin, and is often associated with a personal or family history of atopy, which includes conditions like asthma, allergic rhinitis, and atopic dermatitis itself.

## **Why the Correct Answer is Right**
Atopic dermatitis typically presents in infancy or early childhood, often with an itchy, inflamed rash. In infants and young children, the rash often appears on the extensor surfaces of the limbs, face, and neck, which matches the description given. The presence of a family history of atopic diseases, such as the mother having bronchial asthma, supports the diagnosis of atopic dermatitis. The condition is part of the "atopic march," where children with atopic dermatitis are at increased risk of developing other atopic conditions like asthma and allergic rhinitis.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include conditions like contact dermatitis, seborrheic dermatitis, or psoriasis, which do not have the same strong association with a family history of atopic diseases or the typical distribution and characteristics of atopic dermatitis in children.
- **Option B:** Similarly, without the specific content of Option B, it's hard to directly address, but generally, conditions that don't fit the clinical picture of atopic dermatitis or lack the familial atopic predisposition would be incorrect.
- **Option D:** Again, without specifics, one can infer that any condition not aligning with the clinical presentation of atopic dermatitis (e.g., lack of itchy, inflamed skin; no family history of atopy) would be incorrect.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is the "atopic march," which describes the progression of atopic diseases from atopic dermatitis in infancy to asthma and allergic rhinitis in later childhood. Recognizing atopic dermatitis early, especially in the context of a family history of atopy, allows for early intervention and potentially altering the course of the atopic march.

## **Correct Answer:** . Atopic Dermatitis (Eczema)