**Core Concept**
Intraepithelial bullae are a characteristic feature of certain skin disorders, where the blister forms within the epidermis. This occurs due to the separation of keratinocytes at the level of the basal cell layer or within the spinous layer.

**Why the Correct Answer is Right**
The correct answer is associated with Pemphigus Vulgaris, an autoimmune disease that involves the formation of intraepithelial bullae. This occurs due to the presence of autoantibodies against desmoglein 3 and 1, which are components of the desmosomal complex that maintains cell-to-cell adhesion in the epidermis. The autoantibodies lead to the disruption of the desmosomes, resulting in the separation of keratinocytes and the formation of intraepithelial bullae.

**Why Each Wrong Option is Incorrect**
**Option A:** Bullous Pemphigoid is characterized by subepidermal bullae, not intraepithelial bullae. It involves the formation of autoantibodies against the basement membrane zone, leading to the separation of the epidermis from the dermis.
**Option B:** Porphyria Cutanea Tarda is a disorder that affects the production of heme, leading to photosensitivity and blistering, but it does not typically present with intraepithelial bullae.
**Option C:** Staphylococcal Scalded Skin Syndrome (SSSS) is a bacterial infection caused by staphylococci, which produces exfoliative toxins that cleave desmoglein 1, leading to intraepidermal bullae, but not intraepithelial bullae.

**Clinical Pearl / High-Yield Fact**
When evaluating a patient with blistering skin disease, it is essential to consider the location and characteristics of the bullae, as well as the patient's medical history and laboratory findings. Intraepithelial bullae are typically seen in autoimmune disorders, such as Pemphigus Vulgaris, whereas subepidermal bullae are more commonly associated with autoimmune disorders, such as Bullous Pemphigoid.

**Correct Answer:** D.