Parry-Romberg syndrome is a rare, slowly progressive, autolimitated disease, characterized by unilateral facial atrophy. It is usually manifested in childhood and young adulthood. Because of the degree of atrophy and the variety of symptoms, the diagnosis, prognosis, and treatment of Parry-Romberg syndrome are a major challenge. The purpose of this case presentation is to highlight the difficulty of establishing the diagnosis, furthermore, to present the steps of examining the patient and to draw attention to the importance of proper timing of the surgery. Moreover, it wants to emphasize the importance of looking for diseases that often occur with the mentioned syndrome. Orv Hetil. 2020; 161(28): 1181-1185.