Also known as "indolent ulcer", rodent ulcers are ulcerations and swelling of the lip which develop in response to an underlying allergy. Rodent ulcer is part of a "syndrome" known as eosinophilic granuloma complex, which comes in three forms.
Brown spots in the iris (the pigmented part of your cat's eyes) are a relatively common in cats. In most cases they is caused by the benign growth of pigmentation cells within the iris (similar to moles).
Just like humans, cats can begin to lose their mental faculties as they move into their senior years. This can come as quite a shock to pet owners, as dementia is not something most people associate with cats. This condition is known as "cognitive dysfunction syndrome".
Cats are curious little creatures but sometimes that curiosity can result in injury. The most common type of electrical injury to occur in cats is from chewing electrical cords.
Lipomas are slow growing, benign (non cancerous) tumours of the fat cells that are surrounded by a fibrous capsule. They are quite rare in cats and when they do occur, are mostly seen in older cats. They can develop on any part of the body, both inside and out, and they may be singluar or multiple.
A mouth ulcer (or mouth sore) is an open sore which can affect the gums and tongue. They are formed when the delicate tissues in the oral cavity are eroded and can be caused by injury, infection or cancer. They are not a disease in themselves, but rather they are a symptom of an underlying condition.