After the appearance of bald patches, they are mostly benign and there won't be any necrosis of the hair follicles. Hair follicle necrosis usually occurs in several situations, such as local trauma or previous folliculitis, and in cases of alopecia areata that have not been treated for a long time, where the cause of the disease has not been corrected, leading to follicle atrophy and eventually necrosis. Once hair follicle necrosis occurs, treatment becomes quite complicated, and some people may never fully recover.

Once alopecia areata occurs, it is crucial to seek medical care from reputable medical institutions, undergo proper testing and treatment, avoid spicy and irritating foods, refrain from eating overly flavorful foods, avoid staying up late, and minimize anxiety and stress. Strengthening exercises and enhancing immunity, if consistently maintained, can still lead to recovery.