There are many kinds of Teddy skin diseases, and the symptoms are also different. They can be roughly divided into fungal, bacterial and mite diseases. Fungal skin diseases are generally of the ringworm type. The main feature is that the dog's coat sheds in a round shape, and the skin will also appear in the form of round patches of redness, swelling, pus and dandruff, and it will recur and be stubborn; Bacterial skin diseases manifest as scattered papules and pus, which look like hair follicle damage, and generally do not have many itching symptoms; while mite skin diseases generally appear around the ears, toes, mouth, eyes and nose, and can be severe. It will develop to the whole body, with hair loss and redness all over the body, wrinkles on the skin, secretions and dandruff, and extreme itching. Accurate confirmation requires going to the hospital for a microscopy.