Intraepidermal blisters are seen in – a) Bullous pemphigoidb) Pemphigus folliaceousc) Dermatitis herpatiformisd) Bullous SLEe) Bullous impetigo

**Core Concept**
Intraepidermal blisters are a type of skin lesion that occurs within the epidermis, the outermost layer of the skin. This type of blistering is characteristic of certain autoimmune and infectious diseases. The underlying principle being tested is the ability to distinguish between different blistering skin diseases based on their histopathological features.

**Why the Correct Answer is Right**
Pemphigus foliaceus is an autoimmune disease that involves the formation of antibodies against desmoglein 1, a protein that helps hold epidermal cells together. This leads to a loss of cell-cell adhesion and the formation of intraepidermal blisters. The disease is characterized by the presence of these blisters, which are typically superficial and may rupture easily, leaving behind erosions.

**Why Each Wrong Option is Incorrect**
**Option A:** Bullous pemphigoid is a disease that involves the formation of subepidermal blisters, not intraepidermal blisters. **Option C:** Dermatitis herpetiformis is a condition that involves the formation of subepidermal vesicles, not intraepidermal blisters. **Option D:** Bullous SLE is a rare manifestation of systemic lupus erythematosus that involves the formation of subepidermal blisters. **Option E:** Bullous impetigo is a bacterial infection that can cause intraepidermal blisters, but it is not the most characteristic example of this type of blistering.

**Clinical Pearl / High-Yield Fact**
Intraepidermal blisters are a key feature of pemphigus foliaceus, and this disease should be considered in the differential diagnosis of any patient presenting with superficial blistering skin lesions. A biopsy and immunofluorescence studies can help confirm the diagnosis.

**Correct Answer:** B. Pemphigus foliaceus