원형 탈모증, also known as Alopecia Areata, is an autoimmune condition that causes sudden hair loss in round patches on the scalp or other areas of the body. It occurs when the immune system mistakenly attacks hair follicles, leading to hair falling out. The exact cause is not fully understood, but it may be linked to genetic factors and environmental triggers. This condition can affect people of all ages and genders, and while it is not life-threatening, it can impact self-esteem and emotional well-being. Treatment options include topical medications, corticosteroids, and other therapies aimed at promoting hair regrowth and managing symptoms.