**Question:** Characteristic bodies in Lichen planus:

A. Bodies of Auspitz
B. Kogoj's bodies
C. Koebner phenomenon
D. Blueberry muffin bodies

**Correct Answer:** .

**Core Concept:** Lichen Planus is a chronic, immune-mediated, inflammatory disorder affecting the skin, mucous membranes, and nails. It is characterized by the presence of characteristic immune complexes or bodies within the dermal papillae, which is a hallmark of the disease.

**Why the Correct Answer is Right:**

The correct answer, D. Blueberry muffin bodies (B. Blueberry Muffin Mucosal Lesions), refers to the histopathological feature of Lichen Planus, where immune complexes are present within the dermal papillae. These immune complexes or bodies give the mucosal lesions a characteristic blueberry muffin appearance. This is one of the key features used to differentiate Lichen Planus from other mucocutaneous disorders with similar presentations.

**Why Each Wrong Option is Incorrect:**

A. Auspitz's bodies (Keratotic scales) and B. Kogoj's bodies (keratinized cells) are not characteristic of Lichen Planus. Auspitz's bodies are seen in epidermolytic ichthyoses, while Kogoj's bodies are a feature of pemphigus vulgaris, another autoimmune blistering disorder.

C. Koebner phenomenon is a response in which an injury to a part of the body leads to the development of lesions in an uninvolved skin or mucous membrane areas. It is not a feature of Lichen Planus but is seen in psoriasis and other diseases like pemphigus vulgaris and pemphigoid diseases.

**Clinical Pearl:** Lichen Planus is a chronic mucocutaneous disease characterized by the formation of immune complexes within the dermal papillae, leading to a characteristic mucocutaneous presentation. Recognizing these bodies is crucial in differentiating Lichen Planus from other mucocutaneous diseases with similar presentations.