Conjunctival Melanoma

Conjunctival melanoma is a rare but serious type of cancer classified under ocular melanoma, a group of melanomas that affect the eye. It originates in the conjunctiva, the transparent membrane covering the white outer surface of the eye (sclera), the inner surface of the eyelids, and the caruncle—the small, fleshy tissue located in the corner of the eye nearest the nose. This membrane plays a vital role in protecting and lubricating the eye, making malignancies in this area particularly concerning due to their potential impact on vision and overall eye health.

Accounting for only about 2% (one in fifty) of all ocular melanomas, conjunctival melanoma is relatively uncommon. Despite its rarity, it demands prompt attention and management due to its ability to spread locally and metastasize to distant parts of the body, such as the lungs, liver, or brain.

The causes of conjunctival melanoma, like other types of ocular melanoma, are not fully understood. However, several risk factors have been identified. Chronic exposure to ultraviolet (UV) light is suspected to play a significant role, particularly in melanomas that develop in sun-exposed areas of the eye. This connection mirrors the well-established link between UV light and other skin melanomas, as well as iris melanomas, which arise in the colored portion of the eye. Fair-skinned individuals and those with extensive sun exposure may face a heightened risk.

Conjunctival melanoma often develops from pre-existing pigmented lesions, such as a nevus (a mole-like growth) or primary acquired melanosis (PAM), although it can also appear de novo without prior lesions. Symptoms may include a new or changing pigmented spot on the eye, irritation, or redness.

Early detection and treatment are crucial for improving outcomes. Patients experiencing unusual eye changes or noticing a pigmented growth should consult an ophthalmologist promptly. Management typically involves surgical removal and close monitoring to minimize recurrence risks.