Foot fungus, also known as tinea pedis, is linked to diabetes. Diabetics with poor blood sugar control are prone to infections. Tinea pedis is a fungal infection, and untreated fungal infections are prone to skin breakdown, which can lead to bacterial infections and diabetic foot. If the patient’s blood sugar control is not good, it will lead to the worsening of the infection symptoms, and the infection will further lead to the blood sugar not easy to control, and the two will form a negative impact on each other. Diabetic patients suffering from tinea pedis must be treated as soon as possible, and the dermatologist to provide treatment advice, adhere to the course of treatment to achieve the purpose of treatment, prevention of tinea pedis can prevent the occurrence of diabetic foot.