Hot spots are most commonly caused by:
* *Insect bites and stings, especially fleas, ticks, and mosquitoes*. These bites can cause intense itching, which can lead to self-trauma as the dog tries to scratch the affected area.
* *Allergies*. Allergies to food, environmental allergens (such as pollen and dust mites), or contact allergens (such as plants or chemicals) can all cause itching and skin irritation, which can lead to hot spots.
* *Ear infections*. Ear infections can cause extreme pain and itching in the ear, leading to self-trauma and the development of a hot spot.
* *Skin injuries. Cuts, scrapes, and other skin injuries can become infected and develop into hot spots.
* *Demodectic mange*. This skin condition is caused by a microscopic mite that lives on the skin of all dogs. In some dogs, the mites can multiply and cause skin lesions, including hot spots.
* *Autoimmune diseases*. Certain autoimmune diseases, such as lupus and pemphigus, can cause skin lesions that resemble hot spots.
* *Stress*. Stress can trigger or exacerbate hot spots in some dogs.