Progressive Hemifacial Atrophy, also known as Parry-Romberg Syndrome, is a rare disorder characterized by a gradual wasting away of the skin and soft tissue on one side of the face. As the condition progresses, it can cause facial asymmetry, disfigurement, and functional impairment. There are several synonyms for Progressive Hemifacial Atrophy, including hemifacial atrophy, Romberg Syndrome, Romberg's disease, and facial hemiatrophy. Although the exact cause of the condition is still unknown, some theories suggest that it may be an autoimmune disorder or a result of abnormal blood vessel development. Treatment options are limited and include surgery, reconstructive measures, and occasionally, immunomodulatory therapy.