Excoriations and ulcers on the arms and legs

Journal of Family Practice, Sept, 2004 by Richard P. Usatine, Miguel A. Saldana-Arregui

A 55-year-old woman came to the clinic complaining of severe itching on her arms and legs. Although she itched throughout the day, it became intolerable at night, disrupting her sleep. She would sometimes scratch her arms and legs until exhaustion but could find no relief. Being outside in warm and sunny weather aggravated the problem. She had used moisturizers, emollients, and topical corticosteroids, but they only alleviated the itching temporarily. The itching began 10 months earlier, just after she finalized the divorce from her husband of 20 years.

Examination of the skin revealed numerous excoriations with ulcerations and xerosis on the arms and left leg (Figure 1 and 2). The excoriations were located extensively from the dorsum of her left foot to above the knee and bilaterally from the wrist to above the elbow. They also showed signs of infection. The patient admitted they were self-inflicted. The patient's right leg had been amputated 5 years before after a car accident, and she wore a prosthetic leg. Examination of other areas showed nothing remarkable.

[FIGURES 1-2 OMITTED]

The patient readily admitted to a great deal of psychological distress. She described feeling depressed since her divorce. She has had difficulty securing a full-time job and has high anxiety about being able to pay her rent and bills.

* WHAT IS THE DIAGNOSIS?

* WHAT IS THE TREATMENT STRATEGY?

* DIFFERENTIAL DIAGNOSIS: PSYCHODERMATOLOGIC DISORDER

The patient's history and physical examination points to a psychodermatologic disorder. Psychodermatologic disorders are conditions involving an interaction between the mind and skin and are classified as: (3)

* Psychophysiologic disorders: skin disorders worsened by emotional stress

* Primary psychiatric disorders: usually caused by psychological conditions with self-induced skin damage

* Secondary psychiatric disorders: psychological problems developed as a consequence of a disfiguring skin disorder, which negatively effects self-esteem and body image. (3)

This patient's excoriations and ulcers are due to self-mutilation. The differential diagnosis includes psychogenic parasitosis, factitial dermatitis, and neurotic excoriations. These 3 skin conditions are primary psychiatric symptoms, and proper diagnosis revolves around being able to assess the dermatologic features and associated psychological disorder. (2)

Psychogenic parasitosis

Also known as delusional parasitosis, psychogenic parasitosis is a psychodermatologic disorder in which patients believe they are infested with parasites. Patients with this disorder report seeing or feeling parasites on their skin, and they damage their skin in an attempt to remove them. Patients create excoriations and ulcers on easily reached areas, usually the ears, eyes, nose, and extremities. They often present with what is termed the "matchbox sign," in which they bring containers filled with "small bits of excoriated skin, dried blood, debris, or insect parts as proof of infestation." (2)

Women over the age of 50 years are more often affected with psychogenic parasitosis, and the disorder is associated with anxiety, depression, and hypochondriasis.

Factitial dermatitis

Factitial dermatitis, also known as dermatitis artefacta, is a psychodermatologic disorder in which patients damage their skin but deny their self-involvement. This disorder encompasses a wide range of lesions, including blisters, cuts, ulcers, and burns. Patients often are unable to describe how the lesions evolved. Lesions exhibit bizarre patterns not characteristic of any disease.

Young adults and adolescents are more commonly affected, and it is 4 times more common among women than men. Psychological disorders involved with factitial dermatitis include personality disorders and posttraumatic stress disorder. (2)

Neurotic excoriations

Neurotic excoriations, sometimes referred to as neurodermatitis, are a result of a psychodermatologic disorder in which patients inflict excoriations and ulcers on their skin and admit to their involvement. (3) The condition is characterized by excoriations similar in size and shape that are localized on areas easily reached by the patient, such as the arms, legs, and upper back.

The lesions may present in various stages, varying from dug-out ulcers to ulcers covered with crusts and surrounded by erythema to areas receding into depressed scars. These lesions are a result of repetitive scratching and digging by the patient, usually without an underlying physical pathology but sometimes initiated by pruritus. (1,2)

Studies show the condition primarily affects women, with a mean onset between the ages of 30 to 45 years. (1) Common psychiatric problems associated with neurotic excoriations include significant social stress, depression, anxiety, and obsessive-compulsive disorder.

Diagnosis: Neurotic excoriations due to depression and stress

The patient's history and physical examination suggests a diagnosis of neurotic excoriations due to the characteristics of the excoriations and ulcers on her arms and leg, her admission of their self-inflicted nature, and the associated depression and psychosocial stress.