Rare diseases · Sign or symptom
Ocular melanocytosis
HP:0025534
What it means
A congenital lesion of the sclera characterized by unilateral patchy but extensive slate-gray or bluish discoloration of the sclera . The conjunctiva are spared.
In ocular melanocytosis, Intraocular pigmentation is also increased, which contributes to a higher incidence of glaucoma and increases the risk of malignant melanoma.
Rare diseases that can present with this1
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions, and Orphanet separately records 1 disease where this sign is specifically absent. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Melanosis oculi · Ocular melanosis
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.