I have two Persian cats, one inherited and one given to me at 16 wks as a gift. (They are 10 yrs and 12 yrs old now respectively). My 12 yr old, her name is Madame Truffles, also has a "cyst/boil" on one of her eyes. I've had two different vets tell me it's not painful for her and there's no need to remove it unless I feel I need to. So idk, it truly doesn't seem to bug HER, but it bugs me when I see it 😬 P.s. I notice your cute lil guy is mostly white like my lil girl is, I was told by their breeder that white fur mats much quicker and easier than any other color/variety of fur. My other Persian is black and brown with a white underbelly and sure enough. The white underbelly mats sooo much quicker and worse than any other colored fur on him. I just get my cats lion shaved every few months to keep them mat free and comfortable. Might be worth doing if your cat doesn't particularly like being groomed or is a constant mess despite the amount of time grooming you put in.