What describes excessive concern over a perceived defect in appearance that is not recognized by others?

Body Dysmorphic Disorder is characterized by an intense preoccupation with a perceived flaw in physical appearance, which may be minor or even nonexistent. Individuals with this disorder often spend excessive time focusing on this perceived defect, resulting in significant distress and impairment in daily functioning. They may seek multiple cosmetic procedures or engage in behaviors aimed at improving their appearance, yet remain dissatisfied. In contrast to other conditions, the concern is specifically about appearance and is not recognized by others, meaning that people surrounding the individual do not perceive the defect in the same way.

The other conditions mentioned in the options involve different focuses and symptoms. Hypochondriasis primarily revolves around the fear of having a serious illness despite a lack of serious medical evidence. Somatization Disorder includes physical symptoms that cannot be fully explained by a medical condition, but these are not specifically focused on appearance as in Body Dysmorphic Disorder. Anorexia Nervosa is an eating disorder that primarily involves an intense fear of gaining weight and a distorted body image, but the excessive concern is more about body weight rather than a specific defect. Thus, Body Dysmorphic Disorder stands out as the correct answer due to its precise focus on the perception of a defect in appearance not acknowledged by others.