Ringworm is an infection of skin, hair, or claws caused by a type of fungus known as a dermatophyte. In cats, about 98% of ringworm cases are caused by the fungus Microsporum canis. The fungus is spread easily in the environment and often infects people.
The fungi spread to people primarily by contact with infected cats and contaminated objects, such as furniture or grooming
Pyoderma can be caused by infection, inflammation, or cancer. It is not common in cats. Bacterial pyoderma is usually caused by an overgrowth of bacteria that normally or temporarily live on the skin. The infection is usually triggered by an underlying condition, such as allergies, flea or mite infestation, and chin acne. However, any disease that causes itching and self-trauma can trigger a pyoderma. Warm, moist areas of the skin (such as areas around the mouth, genitals, and to
One pox virus is known to infect cats. It has been reported occasionally in the United Kingdom (Great Britain) and Western Europe, but not in the United States. The virus is indistinguishable from cowpox virus. Cats are believed to contract this virus while hunting. Most infected cats are from rural environments and are known to hunt rodents, which are believed to be the reservoir host. Infection in cats is seasonal with most cases occurring between September and Nov
Photosensitization is a condition in which skin is overly sensitive to sunlight; it is not the same as sunburn. Certain molecules present in the skin are energized by light. When the molecules return to the less energized state, the released energy causes chemical reactions in the skin. Photosensitization can be difficult to distinguish from actual sunburn.
Photosensitization is often classified according to the source of the photodynamic pigment
Helminths are parasitic worms. Dracunculus insignis is a species of roundworm found mainly in the connective tissue beneath the skin of the host animal's legs. They are known to infest raccoons, minks, and other animals in North America. Female worms can reach more than 1 foot (300 millimeters) in length. Male worms are tiny in comparison, approximately 0.8 inches (20 millimeters) long. These worms are rare in cats, but they are occas
Mange is caused by microscopic mites that invade the skin of otherwise healthy animals. The mites cause irritation of the skin, resulting in itching, hair loss, and inflammation. All forms of mange are highly contagious. Cats are very susceptible to several types of mange, including canine scabies, feline scabies (notoedric mange), ear mites (otodectic mange), walking dandruff (cheyletiellosis), and trombiculosis. Demodicosis is not considered mange, but it is also c
Lice are small, flightless insects that live in the hair or feathers of animals and people. Most lice are of the biting or chewing type, including the cat louse (Felicola subrostrata). Lice are most often seen on older, longhaired cats that are no longer able to groom themselves. With the widespread use of monthly flea and tick preventive treatments, lice infestations are now rare in cats and dogs. When seen, infestations are usually
The medical term for itching is pruritus. Itching is defined as an unpleasant sensation within the skin that provokes the desire to scratch.
Itching is a sign, not a diagnosis or a specific disease. The most common causes of itching are parasites, infections, and allergies. There are many skin diseases that do not initially cause itching. However, itching may develop with these diseases due to secondary bacterial or yeast infections. It is possib
Hives or skin rashes (urticaria) are small patches of red, swollen, usually itchy, skin. They are very rare in cats and are most often associated with insect bites or stings or with medications. Hives may develop after inhaling, touching, or consuming allergens. When hives occur with severe swelling and fluid accumulation in other parts of the body (usually the head, legs, respiratory tract, or genitals), the allergic reaction can be life threatening.
Alopecia is the partial or complete lack of hair in areas where it is normally present. Hair loss is a sign, and its underlying cause must be determined in order to be treated. If a cat has hair loss and is scratching the area excessively, the itching problem should be investigated first.
Hair loss can be congenital (present at birth) or acquired. Congenital hair loss may or may not be hereditary. It is caus