**Core Concept**
Dermatitis herpetiformis is a chronic skin condition characterized by intensely itchy, blistering skin lesions. It is a cutaneous manifestation of an underlying systemic disease, specifically an autoimmune response to gluten.

**Why the Correct Answer is Right**
Dermatitis herpetiformis is strongly associated with celiac disease, an autoimmune disorder triggered by gluten intake. The condition is caused by the formation of immune complexes in the skin, which leads to the deposition of IgA antibodies and activation of complement. This results in the characteristic skin lesions. The pathophysiology involves a complex interplay between genetic predisposition, environmental factors, and immune system dysregulation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because dermatitis herpetiformis is not primarily associated with atopic dermatitis, which is a distinct allergic skin condition characterized by eczema and pruritus.
**Option B:** This option is incorrect because psoriasis is a different autoimmune skin condition characterized by scaly, silvery plaques, not blistering skin lesions.
**Option C:** This option is incorrect because seborrheic dermatitis is a skin condition characterized by flaky, oily lesions, not blistering skin lesions.

**Clinical Pearl / High-Yield Fact**
Dermatitis herpetiformis is a classic example of a dermatologic condition with a systemic cause, emphasizing the importance of considering underlying medical conditions when evaluating skin symptoms.

**Correct Answer: C. Celiac disease**