Erythromycin is used for interphalangeal inflammation in cats. Erythromycin ointment has certain antibacterial and anti-inflammatory effects, and can be applied to the inflammation focus between cats' toes. Mild interphalangeal inflammation can be used, and serious ones need to go to the hospital for treatment. Cat interphalangeal inflammation is mostly caused by bacterial infection, and can also cause other infections such as fungi and parasites.