A patch of hair loss on the scalp may be caused by other reasons such as baldness, ringworm, folliculitis, and discoid lupus erythematosus. 1. Patchy baldness: Patchy baldness may be caused by heredity, excessive mental stress, abnormal immune function and other factors. Patients will suddenly have patchy hair loss, loose hair and other manifestations, so patients will have the symptom of a piece of hair loss on the scalp. 2. Ringworm of the head: ringworm of the head is considered to be caused by infection of pathogenic bacteria such as Microsporum spp. and Trichophyton spp. Patients will have symptoms such as extensive scaling of the scalp, hair loss, hair breakage, etc., so patients will show the performance of a piece of scalp hair loss. 3. Folliculitis: scalp folliculitis is mostly considered to be caused by Staphylococcus aureus infection, the patient can be manifested as pimples, itching, pain and other manifestations, if the scalp follicle damage is serious, there will be alopecia, localized scarring symptoms, so that the patient’s scalp a piece of the folliculitis will be the symptoms of hair loss. 4. Other: patients head discoid lupus erythematosus, lichen planus can also lead to patients with a piece of scalp hair loss performance. It is recommended that the patient has a piece of scalp hair loss performance timely medical treatment, can be under the guidance of the doctor to choose the appropriate measures of treatment.