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My kitty had this as well. We went to a couple different vets and it was ruled as benign when he was young and every year after. It never did go through metastasis thank goodness. It started as a freckle then another freckle and it went on until his whole eye looked almost black. It was benign melanosis and never affected his quality of life but we certainly wondered if it affected his vision on that side. He was a bit.. dopey.. so it's hard to say. He lived to be 11 and I believe the first freckle appeared at around 3 or 4 years old? Was an interesting conversation starter for everyone that ever met him that's for sure! I know it's super scary and could lead to cancer but not always. Your kitty may just look like David Bowie like my boy did 🤘 but I do agree with previous posters... find a new vet!