Which of the following conditions produce a seborrheic dermatitis like lesions in an infant?
**Core Concept**
Seborrheic dermatitis is a common skin condition characterized by a distinctive rash, often accompanied by inflammation and flaking. In infants, it typically presents as a cradle cap or nappy rash. However, several conditions can mimic seborrheic dermatitis in infants, making differential diagnosis essential.
**Why the Correct Answer is Right**
Infantile acrodermatitis enteropathica is a rare genetic disorder that causes skin lesions, including those resembling seborrheic dermatitis. This condition is caused by a defect in the gene encoding the ZIP4 zinc transporter, leading to impaired zinc absorption. The skin lesions in acrodermatitis enteropathica are often accompanied by hair loss, diarrhea, and failure to thrive.
**Why Each Wrong Option is Incorrect**
* **Option A:** Erythema toxicum neonatorum is a common, self-limiting rash that typically resolves within the first week of life. While it can present with a variety of skin lesions, it does not typically cause seborrheic dermatitis-like lesions.
* **Option B:** Congenital syphilis can cause a range of skin lesions, including those resembling seborrheic dermatitis. However, the presence of other systemic symptoms, such as hepatosplenomegaly and lymphadenopathy, would be more characteristic of congenital syphilis.
* **Option D:** Contact dermatitis can cause skin lesions that resemble seborrheic dermatitis, but it is typically associated with a history of exposure to an allergen or irritant.
**Clinical Pearl / High-Yield Fact**
When evaluating a seborrheic dermatitis-like rash in an infant, consider the possibility of underlying conditions such as acrodermatitis enteropathica, especially if the rash is accompanied by systemic symptoms or failure to thrive.
**Correct Answer: C. Infantile acrodermatitis enteropathica**