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Hi. My name is***** I'm sorry to hear about this situation with your little one. When an eye is suddenly being held shut / squinting, and it seems swollen and painful - a scratch / ulcer has to be a very suspicious situation. Sometimes these can be seen with the naked eye. At my ER some can only be seen when a special dye called fluorescein has been used to stain the eye for defects in the cornea which come from ulcers / scratches. If there is a kitten in the house, then them playing and a scratch to the eye could have happened. As far as what can you do at home for this? Unfortunately nothing. You shouldn't place anything in the eye or try to give him anything for pain relief. There are no safe pain medications for cats that an owner has at home. The best thing you can do is to get him to your vet / ER clinic as soon as you can so they can confirm a diagnosis and start up topical medications. They may start some oral medications as sometimes the cornea has been punctured by a claw and this can set up an infection inside the eye.