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Senile gluteal dermatosis: a clinical study of 137 cases

Authors

  • Han-Nan Liu MD,

    Corresponding author
    1. Department of Dermatology, Taipei-Veterans General Hospital, National Defense Medical Center, Taipei, Taiwan
    2. Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan
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  • Wen-Jen Wang MD,

    1. Department of Dermatology, Taipei-Veterans General Hospital, National Defense Medical Center, Taipei, Taiwan
    2. Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan
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  • Chih-Chiang Chen MD,

    1. Department of Dermatology, Taipei-Veterans General Hospital, National Defense Medical Center, Taipei, Taiwan
    2. Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan
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  • Ding-Dar Lee MD,

    1. Department of Dermatology, Taipei-Veterans General Hospital, National Defense Medical Center, Taipei, Taiwan
    2. Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan
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  • Yun-Ting Chang MD, PhD

    1. Department of Dermatology, Taipei-Veterans General Hospital, National Defense Medical Center, Taipei, Taiwan
    2. Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan
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  • Conflicts of interest: none declared.

Abstract

Background

Senile gluteal dermatosis (SGD) is a common genital dermatosis but has gained little attention before. A large-scale clinical study of this disease is lacking.

Materials and methods

We examined 162 consecutive outpatients with gluteal skin diseases of different causes. Fourteen skin biopsies were performed. Patient's age, gender, body mass index (BMI), way of sitting or lying, treatment response, and underlying systemic diseases were recorded.

Results

About 137 (85%) patients could be defined as SGD. These patients, with a mean age of 79.4 ± 40.7 years and a mean BMI of 21.7 ± 10.8, presented with either partial (n = 43, 31%) or full-blown (n = 94, 69%) SGD lesions characterized by the sign of so-called “three corners of a triangle”: brownish plaques on the gluteal cleft and each side of the buttocks. Male/female ratio was 130/7. Itching or pain of varying intensity was reported by 50 patients (36%) and 14 patients (10%), respectively. Eighty-six patients (53%) presented with horizontal hyperkeratotic ridges, a characteristic sign of SGD. Most patients spent most of the day sitting but reported no special way of sitting or lying. More than half of patients with SGD claimed no response to topical steroids and/or keratolytics. In comparison with patients with SGD, SGD-free patients were younger (61.3 ± 36 years, P = 0.0005) and heavier (BMI 26.2 ± 15.6, P < 0.0001) but showed no significant difference in the frequency of underlying systemic diseases.

Conclusions

SGD is a common dermatosis, mostly affecting the thinner elderly. Friction, pressures and long hours sitting seemed to be important factors to trigger this dermatosis.

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