The blackening of the cat's orbital rim may be caused by increased eye secretions and scabbing. The owner can first use a wet wipe to wet the blackened area to clean it, and then apply some erythromycin ointment. If black scabs often appear in the cat's eye sockets, it is recommended that the owner carefully check the pet's diet to see if it is too greasy or salty, which may cause the cat to get angry and increase eye secretions.