This situation is most likely caused by pigmentation in the dog's body, because the food the dog eats contains a lot of melanin, which will be deposited on the skin if the dog cannot excrete it, showing large black spots. If your dog is infected with fungus, dark spots may appear on the skin after using the drug. This is a normal phenomenon during the treatment process and will generally recover about 7-14 days after stopping the drug. In addition, dogs often exercise outdoors and go out to bask in the sun, which can also form dark spots under ultraviolet rays.

How to treat dog skin diseases:

1. If the symptoms of dog skin diseases are mild, you can use mucosal disinfectants, such as: Reifonol Clean, then use corticosteroid ointment, or apply antibiotics together; for more severe dogs, cortisone chloride can be used.

2. If the dog’s skin disease is large, you can give the dog corticosteroids and antibiotics. If the symptoms are serious, you need to take the dog to a pet hospital for treatment.

3. During the treatment period, the dog needs to be kept hygienic, disinfected regularly, and the dog needs to be prevented from licking the skin due to itching.