To determine if baldness is a fungal infection, clinical symptoms and laboratory tests can be used. Fungal infection of the scalp can cause diseases such as tinea capitis, which often leads to symptoms such as more white scales on the patient’s scalp, hair loss and itching. Usually taking hair or dandruff for fungal microscopy can find positive manifestations such as fungal hyphae or fungal spores. Patchy baldness is caused by autoimmune disorder. It is caused by factors such as mental stress, often manifested as a sudden appearance of hair loss spots, usually without dandruff, itching and other symptoms. Laboratory fungal microscopy cannot see positive manifestations such as fungal hyphae and spores. If you suspect baldness or ringworm, it is recommended to go to the hospital in time to improve the relevant examination, clear diagnosis and symptomatic treatment.