A chalazion is a swollen, pain-free lump on the eyelid. It gradually forms when the meibomian gland, a sebaceous (oil) gland, is blocked. A chalazion is sometimes called an eyelid cyst or a ...

A local veterinarian referred an eight-year-old castrated male Himalayan dwarf rabbit to a veterinary ophthalmologist for treatment of a tumor on the left upper eyelid, which the rabbit's owner ...