Whether hair loss can grow back or not is related to the severity of the disease. The main causes of hair loss include seborrheic alopecia, ringworm and baldness. Hair loss caused by baldness can generally grow out, seborrheic alopecia and ringworm caused by hair loss whether to grow out need to depend on the situation. 1. Seborrheic alopecia, also known as androgenetic alopecia, in the early stages of the disease, that is, when the hair follicles are not completely atrophied, the timely administration of vasodilating and anti-androgenic drugs can improve the symptoms and promote the growth of hair. When the hair follicle has been completely atrophied and necrosis occurs, the local hair will not grow out again. 2. Tinea capitis is a disease caused by the infection of the scalp with ringworm bacteria, and in the clinic, it will also be manifested as hair loss and breakage of hair, after actively giving anti-fungal drug treatment, the symptoms of hair loss can be controlled, and the subsequent growth of normal hair, and the more commonly used drugs are ketoconazole lotion. For children with yellow ringworm, pus ringworm, because it is easy to cause local necrosis of the hair follicle, so there may be permanent hair loss, in this case the local hair will not continue to grow. 3. Patch baldness is due to a variety of internal and external factors stimulate the formation of a patchy hair loss, commonly known as ghost shaving, timely removal of the cause of the disease and targeted to give glucocorticosteroid drugs (betamethasone), vasodilating drugs (minoxidil tincture), and sedative drugs (diazepam tablets), the symptoms can be improved, the local hair can grow again. Hair loss is recommended to go to the hospital in a timely manner, under the guidance of the doctor for symptomatic treatment.