What are hot spots on dogs

Also known as acute moist dermatitis, hot spots in dogs are localised areas of skin inflammation and bacterial infection. Often a hot spot on a dog will begin as a small red area on the skin that owners may mistake for an insect bite. Unlike an insect bite, a hot spot on your dog will rapidly worsen and spread, developing into a hot, red, oozing, and painful lesion.  

Why does my dog keep getting hot spots? 
Hot spots on dogs are often triggered by scratching, licking, or chewing the affected area of skin. The resulting trauma to the dog’s skin causes inflammation and secondary bacterial infections. Unfortunately, this self-trauma only makes the area more irritated and itchier, which causes a self-perpetuating cycle of itching and scratching. Thus, any condition that causes your dog to feel itchy has the potential to result in a hot spot.  
 
Common causes of the itching/scratching cycle in dogs include:  
- Parasites in dogs  
-Flea allergy dermatitis  
-Dog food allergies  
-Atopic dermatitis  
-Ear or skin infections  
-Anal sac disease  
-Contact irritants  
-Stress or boredom resulting in excessive licking  
-Coat that is dirty or matted  
-Moisture trapped in the coat from swimming or bathing   

Many of these conditions are chronic problems in dogs that can lead to recurring hot spots if they are not appropriately managed. Identifying and addressing the underlying cause of your dog’s hot spot is one of the most important factors in preventing future skin problems.  

Written by Dr. Mariella Roberts, Veterinary Surgeon, Animal Trust Vets CIC | Published May 2025 | Review date May 2027 | This advice is for UK pets only and is not a replacement for seeing a vet