* Hoarding disorder involves compulsive collecting, poor organization skills, and difficulty discarding, but also cognitive deficits in information-processing speed, decision making, and procrastination. Individuals with hoarding disorder find it difficult to throw things away; they are troubled by the feeling of uncertainty—the sense that they might need, for instance, old newspapers, at a later time.
* Excoriation disorder (or skin picking) refers to a particular compulsion, picking at one’s skin, sometimes to the point of injury. Skin picking is more common among women than men and is sometimes seen as a symptom of autism spectrum disorder. Infections and complications with healing are issues with this disorder.
* Trichotillomania (hair pulling) is a disorder in which the person compulsively pulls at their hair, from the scalp, eyebrows, and other body areas. Hair pulling from the scalp can lead to patches of baldness that the person may go to great lengths to disguise.
* Body dysmorphic disorder involves a distressing preoccupation with imagined or slight flaws in one’s physical appearance. Individuals with the disorder cannot stop thinking about their appearance, comparing their appearance to others, checking themselves in the mirror, and so forth. Occurring about equally in men and women, this disorder can involve maladaptive behaviours such as compulsive exercise and bodybuilding and repeated cosmetic surgery.