Skin fungal infections can be caused by indirect contact, diabetes, and medication. 1. Indirect contact infection: sharing slippers, footbaths, washbasins and other supplies with patients with fungal infections can easily lead to indirect contact infections, which can lead to localized fungal skin infections. 2. Diabetes: when suffering from diabetes, may lead to low immunity, fungi breeding in human skin will rapidly multiply, which will lead to fungal infections of skin diseases. 3. Drugs: Prolonged use of hormonal drugs or broad-spectrum antibiotics, such as dexamethasone, methylprednisolone, meropenem, etc., can easily lead to the presence of fungal infections on the skin. When the symptoms of fungal infections appear on the skin, in order to avoid aggravation of the lesions, you should consult a doctor as soon as possible for examination and treatment.