Photo situation may be allergic or inflammation, there has been a swelling, the mouth near the rash similar to human acne, there are bacterial infections, this should be timely to the dog anti-inflammatory sterilization, swelling is appropriate, you can use anti-inflammatory antibacterial spray to the dog treatment, at the same time, home is recommended to use the smell of disinfectant solution environmental disinfection to avoid the dog repeatedly to avoid the dog scratching and adhere to the medication every day to treat, the best! First take to the hospital to confirm the diagnosis of the symptomatic treatment, I hope to help you