Suddenly I found a hairless wound on the dog's hind leg, which was black around and red in the middle, and now it is swollen. Is it a skin disease? A little meat pad on the back foot, too?

This is a symptom of fungal infection, unlike a parasite bite. Fungal infection refers to the occurrence of local round or oval depilation, the affected area is covered with dander and scabs, and some will also have the symptoms of moss. Zhenweining can be used to treat fungal infections. Fungal dermatosis has a long treatment cycle and is easy to recur. Bad environment and climate can easily lead to skin diseases. It is recommended to stick to medication and use it for one week after recovery as consolidation. Dog kennel pads are often exposed to the sun and disinfected indoors!