We examined the prevalence of depression (measured by the Carroll Rating Scale for Depression, CRSD), wishes to be dead and acute suicidal ideation among 480 patients with dermatological disorders that may be cosmetically disfiguring, i.e. non-cystic facial acne (n = 72; 5.6% suicidal ideation), alopecia areata (n = 45; 0% suicidal ideation), atopic dermatitis (n = 146; 2.1% suicidal ideation) and psoriasis (79 outpatients, 2.5% suicidal ideation and 138 inpatients, 7.2% suicidal ideation). Analysis of variance revealed that the severely affected psoriasis inpatients (mean +/- SD total body surface area affected: 52 +/- 23.4%) had the highest (P < 0.05) CRSD score, followed by the patients with mild to moderate acne; both scores were in the range for clinical depression (CRSD score > 10). The 5.6-7.2% prevalence of active suicidal ideation among the psoriasis and acne patients was higher than the 2.4-3.3% prevalence reported among general medical patients. Our findings highlight the importance of recognizing psychiatric comorbidity, especially depression, among dermatology patients and indicate that in some instances even clinically mild to moderate disease such as non-cystic facial acne can be associated with significant depression and suicidal ideation.

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The findings suggest anterior cingulate, frontal, and thalamic involvement in the neuronal circuitry underlying PTSD.

Psychiatric and psychological factors play an important role in at least 30% of dermatologic disorders. In many cases the impact of the skin disorder upon the quality of life is a stronger predictor of psychiatric morbidity than the clinical severity of the disorder as per physician ratings. Furthermore, in certain disorders such as acne and psoriasis, the psychiatric co-morbidity, which can be associated with psychiatric emergencies such as suicide, is an important measure of the overall disability experienced by the patient. The severity of depression and increased suicide risk are not always directly correlated with the clinical severity of the dermatologic disorder. Consideration of psychiatric and psychosocial factors is important both for the management, and for some aspects of secondary and tertiary prevention of a wide range of dermatologic disorders. It is useful to use a biopsychosocial model which takes into account the psychological (e.g. psychiatric comorbidity such as major depression and the impact of the skin disorder on the psychological aspects of quality of life) and social (e.g. impact upon social and occupational functioning) factors, in addition to the primary dermatologic factors, in the management of the patient. Some dermatology patients are likely to benefit from psychotherapeutic interventions and psychotropic agents for the management of the psychosocial comorbidity, in addition to the standard dermatologic therapies for their skin disorder.

Pruritus, or itching, is the most common symptom of dermatologic disease. Psychologic factors can affect pruritus, and in an earlier study of inpatients with moderate to severe psoriasis, we observed that the degree of depressive psychopathology directly correlated with pruritus severity. In this study we investigated the relation between pruritus and depression among a group of patients (N = 252) with a wide range of pruritic skin disorders, including outpatients with mild to moderate psoriasis (N = 77), atopic dermatitis (N = 143) and chronic idiopathic urticaria (N = 32). All patients self-rated the severity of their pruritus on a 10-point scale and completed a battery of psychologic ratings, including the Carroll Rating Scale for Depression (CRSD). We observed a direct correlation (Pearson's r = .34, p < .0001) between pruritus severity and the CRSD score. The correlations between pruritus severity and CRSD scores for each individual diagnostic group were as follows: psoriasis: Pearson's r = .32, p = .004; atopic dermatitis: Pearson's r = .21, p = .013; and chronic idiopathic urticaria: Pearson's r = .34, p = .06. When the subjects with pruritus scores less than 5.5 were compared with subjects with pruritus scores greater than 5.5, significant differences (p < .05) in depression scores were found for all three dermatoses by the Mann-Whitney U test. The depressed clinical state may reduce the threshold for pruritus.

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The comorbidity between depressive symptoms, suicidal ideation, and psoriasis severity is in contrast with reports that severe depression and suicidal ideation are mainly a feature of life-threatening medical disorders such as malignancies. Our finding may have important implications in the management of psoriasis.

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