Treating Cat's Crusty Eye and ChinThe causes for crusty eyes and chins in cats are likely separate issues. The eye problem could be one of several, including allergies, something in the eye, or a viral infection. The chin problem is likely feline acne and is easily treatable. Also allergies to plastic food bowls can cause chin irritation. Check with a vet on both. This is a guide about treating a cat's crusty eye and chin.