Causes of fungal infections: First, it may be related to poor personal hygiene habits or infection from others. For example, if someone else has a fungal infection that causes ringworm, you can get the fungal infection if you share bath towels or slippers with them. This cause is more common in daily life. Second, it is a low function of your own immune system. Third, being in a hot and humid environment for a long time may also cause fungal infections. The main treatment of fungal infection is antifungal treatment. You can apply topical dacrynic acid or take oral antifungal drugs. But oral antifungal drugs can damage the liver, no contraindications before taking drugs. Normally, you should eat less spicy food, avoid smoking and alcohol.