If you see that your dog has hot spots remove the hair around the affected area and treat the wound by applying hydrogen peroxide to clean the wound and applying Neosporin every 12 hours. But if you have been doing this for more than 3 to 4 days with no improvement go to your vet and get a prescription of hydrocortisone. It comes in a cream or spray. It will stop the itching and help with healing. If it's fungus or scabies, they are very contagious.
Use a cone on the dog's head to keep your dog from licking or scratching the hot spot.
The skin affected is moist, oozing, reddened, with hair loss is painful and very itchy to the dog.
Some hot spots my be contagious. The only way to find out is have your vet run a fungal culture and do a skin scraping to determine if it is.
Professional Pet Sitting Services offered in the Upper to Mid-Pinellas County Area