Sudden baldness can be caused by patchy baldness, alopecia areata folliculitis, and ringworm.
1. Patch baldness: may be due to heredity, endocrine disorders and mental stress, etc., patients usually appear oval or round number of hair loss area, so suddenly have a piece of bald hair and no other discomfort symptoms, is likely to be caused by patch baldness.
2. Alopecia Areata Folliculitis: mostly seen in patients with seborrheic dermatitis of the head, mostly caused by infection with Staphylococcus aureus. Such patients may also cause progressive scarring alopecia. Therefore, a piece of hair suddenly bald may also be due to alopecia areata folliculitis.
3. Tinea capitis: mostly caused by dermatophyte infection, if the patient has the symptoms of tinea capitis, it may form grayish-white scales on the affected area, which looks like a piece of hair suddenly bald phenomenon.
To summarize, it is recommended that the patient go to the hospital in time, to clarify the cause of the disease, for treatment.