A 6 month old infant presented with multiple papules & exudative lesions on the face, scalp, trunk and few vesicles on palms and soles for 2 weeks. His mother has H/O itchy lesions. The most likely diagnosis is
**Core Concept**
The question tests the ability to diagnose a common skin condition in infants, likely related to an allergic or infectious etiology, considering the mother's history of itchy lesions. **Atopic dermatitis** and **scabies** are two conditions that come to mind, given the description of itchy lesions and the presence of papules, exudative lesions, and vesicles.
**Why the Correct Answer is Right**
Given the mother's history of itchy lesions and the infant's presentation with multiple papules, exudative lesions, and vesicles, **scabies** is a strong consideration. Scabies is a highly contagious skin infestation caused by the **Sarcoptes scabiei** mite, which can lead to severe itching and a rash. The presence of vesicles on the palms and soles is particularly suggestive of scabies in infants.
**Why Each Wrong Option is Incorrect**
**Option A:** Atopic dermatitis is a possibility but typically doesn't present with vesicles on the palms and soles.
**Option B:** Impetigo is an infectious condition that can present with exudative lesions but is less likely given the mother's history and the specific distribution of lesions.
**Option C:** Contact dermatitis could be a consideration but is less likely given the widespread nature of the lesions and the mother's history of itchy lesions.
**Why Each Wrong Option is Incorrect (continued)**
**Option D:** Other conditions like psoriasis or seborrheic dermatitis are less likely given the clinical presentation and the mother's history.
**Clinical Pearl / High-Yield Fact**
Scabies should be considered in any infant presenting with severe itching and a rash, especially if there's a family history of itchy lesions. The presence of vesicles on the palms and soles is a key diagnostic clue in infants.
**Correct Answer:** D. Scabies.