**Question:** Cobblestone appearance of conjunctiva is typically seen with -

A. Leukoplakia
B. Lymphoma
C. Angiokeratoma
D. Melanosis

**Core Concept:**
The cobblestone appearance of conjunctiva refers to the characteristic pattern of raised, irregular papules on the conjunctiva, which can be indicative of various ocular or systemic conditions. The conjunctiva is the thin mucous membrane that lines the inner surface of the eyelids and covers the white part of the eye (sclera).

**Why the Correct Answer is Right:**
The correct answer is A. Leukoplakia, also known as white plaques of the oral cavity, may extend to the conjunctiva in cases of oral leukoplakia and present with a cobblestone appearance. Leukoplakia is a white patch inside the mouth that cannot be easily rubbed away and is associated with increased risk of oral cancer.

**Why Each Wrong Option is Incorrect:**

A. Lymphoma (option B) is a group of malignant lymphoid tumors involving the lymphatic system. While lymphoma can sometimes affect the conjunctiva, the cobblestone appearance is not a typical feature.

C. Angiokeratoma (option C) is a benign vascular lesion characterized by small, round, red, or bluish papules. The cobblestone appearance does not typify angiokeratoma.

D. Melanosis (option D) is a condition characterized by excessive pigmentation of the skin, hair, or mucous membranes. It does not present with the cobblestone appearance.

**Clinical Pearl:**
The cobblestone appearance of conjunctiva is a crucial finding in the differential diagnosis of various ocular and systemic conditions, including leukoplakia. Early detection and prompt referral to a specialist are essential for proper management and reduction of potential complications, especially in cases of oral leukoplakia, which is associated with an increased risk of oral cancer. A thorough history, examination, and appropriate investigations can aid in reaching a diagnosis and initiating proper treatment plans.