Figure 12.1
Neurodermatitis
This disorder is common in people with skin allergies, eczema, psoriasis, or psychological issues like anxiety and depression. Women are more likely to develop neurodermatitis, and the onset is most common between 30 and 50 years of age. It is also common among children who are unable to stop scratching an insect bite or who have other pruritic skin disorders [1–3].
A primary concern for these lesions is risk of infection and permanent scarring, so they should be monitored on a continual basis. Additionally, a study has shown that patients with neurodermatitis may also suffer from other comorbidities such as sexual dysfunction and depression [1, 2, 4].
Pathogenesis
Patients with neurodermatitis experience a vicious cycle. Their lesions may start with a small irritation to the area, and the patient begins to scratch the itchy area. This constant scratching causes the skin to thicken, and this thickened skin itches which causes more scratching and greater thickening. In this way, patients find relief from scratching the inflamed site and continued subconscious scratching may lead to the recurring eruption [1, 2, 5].
Solak et al. also found that damage to the peripheral nervous system played a role in the etiology of neurodermatitis on the limbs, finding that nerve root compression and radiculopathy were more common in patients with neurodermatitis. As such, these patients should be examined for a possible underlying neuropathy [3].
Clinical Presentation
Laboratory Examinations and Diagnosis
The diagnosis of neurodermatitis is based on a patient’s history of itching and scratching and examination of their skin. A physician may biopsy the affected site to rule out other pruritic conditions [2].
Treatment
The primary goal of treatment is to break the itch-scratch cycle. Physicians may prescribe corticosteroids (Clobetasol) or anti-histamines to relieve the pruritus. Additionally, nodules caused by picking at the scalp may require intralesional injections with triamcinolone acetonide.

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