Excoriation disorder is an obsessive-compulsive spectrum mental disorder that is characterized by the repeated urge or impulse to pick at one's own skin to the extent that either psychological or physical damage is caused.
Episodes of skin picking are often preceded or accompanied by tension, anxiety, or stress. In some cases, following picking, the affected person may feel depressed. During these moments, there is commonly a compulsive urge to pick, squeeze, or scratch at a surface or region of the body, often at the location of a perceived skin defect. When picking one may feel a sense of relief or satisfaction.
The region most commonly picked is the face, but other frequent locations include the arms, legs, back, gums, neck, shoulders, scalp, abdomen, chest, and extremities such as the fingernails, cuticles, toenails, etc. Most patients with excoriation disorder report having a primary area of the body that they focus their picking on, but they will often move to other areas of the body to allow their primary picking area to heal. Individuals with excoriation disorder vary in their picking behaviour; some do it briefly multiple times a day while others can do one picking session that can last for hours. The most common way to pick is to use the fingers although a significant minority of people use tools such as tweezers or needles.
Complications arising from excoriation disorder include infection at the site of picking, tissue damage, and sepsis. Damage from picking can be so severe as to require skin grafting. Severe picking can cause epidermal abscesses. Severe cases of excoriation disorder can cause life-threatening injuries. For example, in one reported case a female picked a hole through the bridge of her nose, which required surgery to fix, and a 48-year-old female picked through the skin on her neck exposing the carotid artery. Pain in the neck or back can arise due to prolonged bent-over positions while engaging in the behavior. Besides physical injuries, excoriation disorder can cause severe physical scarring and disfigurement.
Excoriation disorder can cause feelings of intense helplessness, guilt, shame, and embarrassment in individuals, and this greatly increases the risk of self-harm. Studies have shown that excoriation disorder presented suicidal ideation in 12% of individuals with this condition, suicide attempts in 11.5% of individuals with this condition, and psychiatric hospitalizations in 15% of individuals with this condition.
There have been many different theories regarding the causes of excoriation disorder including biological and environmental factors.
A common hypothesis is that excoriation disorder is often a coping mechanism to deal with elevated levels of turmoil, arousal, or stress within the individual and that the individual has an impaired stress response. A review of behavioral studies found support in this hypothesis in that skin-picking appears to be maintained by automatic reinforcement within the individual.
In contrast to neurological theories, there are some psychologists who believe that picking behavior can be a result of repressed rage felt toward authoritarian parents. A similar theory holds that overbearing parents can cause the behavior to develop in their children.
There is limited knowledge regarding the neurobiology that drives excoriation disorder, and there have been few neuroimaging studies of those with excoriation disorder.
Those individuals that have excoriation disorder along with other diagnosed conditions report differing motivations for their picking. Those with both OCD and excoriation disorder report that they will pick their skin due to perceived contamination of the skin, while those with both body dysmorphic disorder (BDD) and excoriation disorder reportedly pick to fix perceived imperfections in the skin.
Studies have shown a linkage between dopamine and the urge to pick. Drugs such as cocaine and methamphetamine, which increase the pharmacological effects of dopamine, have been shown to cause uncontrollable picking in users. These drugs can create the sensation of formication, which feels like something is crawling on or under the skin. Thus, excoriation disorder could result from a dysfunction in the dopamine reward functions.
There may be another neurological explanation for excoriation disorder: individuals with the condition have less motor-inhibitory control, but show no sign of a difference in cognitive flexibility when compared to individuals without the condition. Motor-inhibitory control is a function of the right-lateralized frontostriatal circuit, which includes the right inferior frontal and bilateral anterior cingulate cortices. The impairment of motor-inhibitory control is similar to the neurological conditions of those who have problems suppressing inappropriate behaviors, such as using methamphetamine.
There is significant evidence to suggest that skin picking disorders are due to inherited traits or genes. There have been multiple small studies with similar conclusions in regards to the SAPAP3 gene. Excessive grooming by mice has been observed by researchers after the deletion of the SAPAP3 gene. This observation led researchers to study the effects of the SAPAP3 gene on patients with trichotillomania—a disorder marked by the same behaviors directed at one′s own head and body hair. This study revealed a significant link between a single nucleotide polymorphism (SNP) within the SAPAP3 gene and trichotillomania.
There has been controversy over the creation of a separate category in the DSM-5 for excoriation (skin picking) disorder. Two of the main reasons for objecting to the inclusion of excoriation disorder in the DSM-5 are: that excoriation disorder may just be a symptom of a different underlying disorder, e.g. OCD or BDD, and excoriation disorder is merely a bad habit and that by allowing this disorder to obtain its own separate category it would force the DSM to include a wide array of bad habits as separate syndromes, e.g., nail-biting, nose-picking, hair pulling, etc. Stein has argued that excoriation disorder does qualify as a separate syndrome and should be classified as its own category because:
However, a review of the scientific literature by Jenkins et al. on excoriation disorder as a separate category in the DSM-5 concluded that such a distinction requires more evidence. Because excoriation disorder is different from other conditions and disorders that cause picking of the skin, any diagnosis of excoriation disorder must take into account various other medical conditions as possible causes before diagnosing the patient with excoriation disorder. There are a variety of conditions that cause itching and skin picking including: eczema, psoriasis, diabetes, liver disease, Hodgkin's disease, polycythemia vera, systemic lupus, and Prader –Willi syndrome.
In order to better understand excoriation disorder, researchers have developed a variety of scales to categorize skin-picking behavior. These include the Skin-Picking Impact Scale (SPIS), and The Milwaukee Inventory for the Dimensions of Adult Skin-picking. The SPIS was created to measure how skin picking affects the individual socially, behaviorally, and emotionally.
As of the release of the fifth Diagnostic and Statistical Manual of Mental Disorders (DSM-5) in May 2013, this disorder is classified as its own separate condition under "Obsessive Compulsive and Related Disorders" and is termed "excoriation (skin-picking) disorder". The diagnostic material is as follows:
Since the DSM-5 (2013), excoriation disorder is classified as "L98.1 Excoriation (skin-picking) disorder" in ICD-10; and is no longer classified in "Impulse control disorder" (f63).
Excoriation disorder is defined as "repetitive and compulsive picking of skin which results in tissue damage".
Its most official name had been "dermatillomania" for some time. As of the release of the DSM-5 in May 2013, excoriation disorder is classified as its own separate condition under "Obsessive Compulsive and Related Disorders" and is termed "excoriation (skin-picking) disorder".
The inability to control the urge to pick is similar to the urge to compulsively pull one's own hair, i.e., trichotillomania. Researchers have noted the following similarities between trichotillomania and excoriation disorder: the symptoms are ritualistic but there are no preceding obsessions; there are similar triggers for the compulsive actions; both conditions appear to play a role in modifying the arousal level of the subject; and the age of onset for both conditions is similar. There is also a high level of comorbidity between those that have trichotillomania and those that have excoriation disorder. A notable difference between these conditions is that skin picking seems to be dominated by females whereas trichotillomania is more evenly distributed across genders.
Research has also suggested that excoriation disorder may be thought of as a type of obsessive compulsive disorder (OCD). Excoriation disorder and OCD are similar in that they both involve "repetitive engagement in behaviors with diminished control" and also both generally decrease anxiety.
Nevertheless, Odlaug and Grant have suggested that excoriation disorder is more akin to substance use disorder than OCD. They argue that excoriation disorder differs from OCD in the following fundamental ways:
Odlaug and Grant have recognized the following similarities between individuals with dermatillomania and patients with addictions:
One study that supported the addiction theory of picking found that 79% of patients with excoriation disorder reported a pleasurable feeling when picking.
Odlaug and Grant also argue that dermatillomania could have several different psychological causes, which would explain why some patients seem more likely to have symptoms of OCD, and others, of an addiction. They suggest that treating certain cases of excoriation as an addiction may yield more success than treating them as a form of OCD.
Knowledge about effective treatments for excoriation disorder is sparse, despite the prevalence of the condition. There are two major classes of therapy for excoriation disorder: pharmacological and behavioral.
Individuals with excoriation disorder often do not seek treatment for their condition, largely due to feelings of embarrassment, alienation, lack of awareness, or belief that the condition cannot be treated. One study found that only 45% of individuals with excoriation disorder ever sought treatment, and only 19% ever received dermatological treatment. Another study found that only 30% of individuals with this disorder sought treatment.
There are several different classes of pharmacological treatment agents that have some support for treating excoriation disorder: SSRIs; opioid antagonists; anti-epileptic agents; and glutamatergic agents. In addition to these classes of drugs, some other pharmacological products have been tested in small trials as well.
Antipsychotic, antianxiety, antidepressant, and antiepileptic medications have all been used to treat skin picking, with varying degrees of success.
SSRIs have shown to be effective in the treatment of OCD, which serves as an argument in favor of treating excoriation disorder with the same therapy. Unfortunately, clinical studies have not provided clear support for this, because there have not been large double-blind placebo-controlled trials of SSRI therapy for excoriation disorder. In fact, in a meta-analysis of pharmacological treatments of excoriation disorders, it was found that selective serotonin reuptake inhibitors (SSRIs) and lamotrigine were no more effective than a placebo for longterm effects. Reviews of treatment of excoriation disorder have shown that the following medications may be effective in reducing picking behavior: doxepin, clomipramine, naltrexone, pimozide, and olanzapine. Small studies of fluoxetine, an SSRI, in treating excoriation disorder showed that the drug reduced certain aspects of skin picking compared with a placebo, but full remission was not observed. One small study of patients with excoriation disorder treated with citalopram, another SSRI, showed that those who took the drug significantly reduced their scores on the Yale –Brown Obsessive Compulsive Scale compared with a placebo, but that there was no significant decrease on the visual-analog scale of picking behavior.
While there have been no human studies of opioid antagonists for the treatment of excoriation disorder, there have been studies showing that these products can reduce self-chewing in dogs with acral lick, which some have proposed is a good animal model for body-focused repetitive behavior. Furthermore, case reports support the use of these opioid antagonists to treat excoriation disorder. Opioid antagonists work by affecting dopamine circuitry, thereby decreasing the pleasurable effects of picking.
Another class of possible pharmacological treatments is glutamatergic agents such as N-acetyl cysteine (NAC). These products have shown some ability to reduce other problematic behaviors such as cocaine addiction and trichotillomania. Some case studies and some small studies of NAC have shown a decrease in picking by treatment with NAC compared with placebo.
Excoriation disorder and trichotillomania have been treated with inositol.
Topiramate, an anti-epileptic drug, has been used to treat excoriation disorder; in a small study of individuals with Prader–Willi syndrome, it was found to reduce skin picking.
Several studies have shown that habit reversal training associated with awareness training reduces skin-picking behavior in those individuals with excoriation disorder that do not have psychological problems. Habit reversal training includes awareness enhancement and competing response training. For example, in one study the competing response training required participants to make a closed fist for one minute instead of picking or in response to a condition that usually provokes picking behavior.
Several different behavioral interventions have been tested to treat excoriation disorder in the developmentally disabled.
One method is to have individuals wear a form of protective clothing that limits the ability of the patient to pick at their body, e.g., gloves or face mask.
Other behavioral treatments attempt to change behavior by providing different incentives. Under Differential Reinforcement of Other Behavior (DRO), a patient is rewarded if able to abstain from the picking behavior for a certain amount of time. In contrast to DRO, Differential Reinforcement of Incompatible Behavior (DRI) rewards an individual for engaging in an alternative behavior that cannot physically occur at the same time as the problem behavior (e.g. sitting on your hands instead of picking at your skin). Lastly, differential reinforcement of alternative behavior rewards behavior that is not necessarily incompatible with the target behavior but serves the same function as the target behavior (e.g., providing people with a competing behavior to occupy their time instead of skin picking).
All of these techniques have been reported to have some success in small studies, but none has been tested in large enough populations to provide definitive evidence of their effectiveness.
Tentative evidence suggests that devices that provide feedback when the activity occurs can be useful.
Typically, individuals with excoriation disorder find that the disorder interferes with daily life. Hindered by shame, embarrassment, and humiliation, they may take measures to hide their disorder by not leaving home, wearing long sleeves and pants even in the heat, or covering visible damage to the skin with cosmetics and/or bandages. When untreated, excoriation disorder can last anywhere from 5 to 21 years. However, many doctors consider this disorder to be a permanent diagnosis.
The prevalence of excoriation disorder is not well understood.
Estimates of the prevalence of the condition range from 1.4 to 5.4% in the general population. One U.S. telephone survey found that 16.6% of respondents "picked their skin to the point of noticeable tissue damage" and that 1.4% would qualify as meeting the requirements of excoriation disorder. Another community survey found a rate of 5.4% had excoriation disorder. A survey of college students found a rate of 4%. One study found that among non-disabled adults, 63% of individuals engaged in some form of skin picking and 5.4% engaged in serious skin picking. Lastly, a survey of dermatology patients found that 2% suffered from excoriation disorder.
In some patients, excoriation disorder begins with the onset of acne in adolescence, but the compulsion continues even after the acne has gone away. Skin conditions such as keratosis pilaris, psoriasis, and eczema can also provoke the behavior. In patients with acne, the grooming of the skin is disproportionate to the severity of the acne. Certain stressful events including marital conflicts, deaths of friends or family, and unwanted pregnancies have been linked to the onset of the condition. If excoriation disorder does not occur during adolescence another common age of onset is between the ages of 30 to 45. Additionally, many cases of excoriation disorder have been documented to begin in children under the age of 10. One small survey of patients with excoriation disorder found that 47.5% of them had an early onset of excoriation disorder that began before age 10. Traumatic childhood events may initiate the behavior.
Excoriation disorder has a high rate of comorbidity with other psychiatric conditions, especially with mood and anxiety disorders . One survey of patients with excoriation disorder found that 56.7% also had a DSM-IV Axis-I disorder and 38% had substance use problems. Studies have shown the following rates of psychiatric conditions found in patients with excoriation disorder: trichotillomania (38.3%), substance use disorder (38%), major depressive disorder (approximately 31.7% to 58.1%), anxiety disorders (approximately 23% to 56%), obsessive-compulsive disorder (approximately 16.7% to 68%), and body dysmorphic disorder (approximately 26.8% to 44.9%). There are also higher rates of excoriation disorder in patients in psychiatric facilities; a study of adolescent psychiatric inpatients found that excoriation disorder was present in 11.8% of patients. It is also present at high rates with some other conditions: 44.9% of patients with body dysmorphic disorder also have excoriation disorder; 8.9% of patients with OCD have excoriation disorder; and 8.3% of patients with trichotillomania have excoriation disorder.
Skin picking is also common in those with certain developmental disabilities; for example, Prader–Willi syndrome and Smith–Magenis syndrome. Studies have shown that 85% of people with Prader–Willi syndrome also engage in skin-picking. Children with developmental disabilities are also at an increased risk for excoriation disorder.
Excoriation disorder also correlates with "social, occupational, and academic impairments, increased medical and mental health concerns (including anxiety, depression, obsessive–compulsive disorder) ... and financial burden". Excoriation disorder also has a high degree of comorbidity with occupational and marital difficulties.
Substance use is often present, and individuals with excoriation disorder are twice as likely to have first-degree relatives who have substance use disorders than those without the condition.
Some cases of body-focused repetitive behaviors found in identical twins also suggest a hereditary factor.
The first known mention of excoriation disorder in the print can be found in 1898 by the French dermatologist Louis-Anne-Jean Brocq, describing an adolescent female patient who had uncontrolled picking of acne.
Excoriation disorder has been the subject of several episodes of Obsessed, a television documentary series that focuses on the treatment of anxiety disorders. Excoriation disorder is shown as a symptom of Nina Sayers' anxiety and OCD in the movie Black Swan.