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    Is Demodex folliculorum an aetiological factor in seborrhoeic dermatitis?
    (Wiley-Blackwell Publishing, Inc, 2009) Karincaoglu, Y.; Tepe, B.; Kalayci, B.; Atambay, M.; Seyhan, M.
    Background. Seborrhoeic dermatitis (SD) is a common inflammatory skin disease for which no single cause has been found, although many factors have been implicated. The mite Demodex folliculorum (DF) is most commonly seen in the pilosebaceous unit in humans. SD is located in areas that are rich in sebaceous glands, which are also preferred by DF. Aims. To compare the number of DF parasites in patients with clinical SD and in healthy controls, and to investigate any possible relationship between the number of DF mites and the presence of SD. Methods. The study comprised 38 patients with SD and 38 healthy controls. Standard random and lesion-specific sampling was performed in the group of patients with SD, whereas standard random sampling only was performed for controls. Results. Demodex folliculorum sampling was positive in 19 patients (50%) and 5 controls (13.1%). Mean DF density was 8.16 +/- 10.1/cm(2) (range 0-40) and 1.03 +/- 2.17/cm(2) (1-7) in patient and control groups, respectively. The differences between groups for DF positivity and mean DF density were significant (P = 0.001 for each). DF was found in 13 lesional areas in the patient group, but in only 5 areas in the control group (P = 0.031). Conclusions. The number of DF mites was significantly higher in both lesional and nonlesional areas of patients with SD. This suggests that, when other aetiological causes are excluded, DF may have either direct or indirect role in the aetiology of SD.
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    Pseudozoster clinical presentation of Demodex infestation after prolonged topical steroid use
    (Wiley-Blackwell, 2008) Karincaoglu, Y.; Tepe, B.; Kalayci, B.; Seyhan, M.
    A 60-year-old man presented with a plaque lesion on the upper right half of the face, which had developed after ophthalmic varicella zoster infection about 2 years previously. The lesion, which was burning and itchy, included a few tiny erythematous pustules, and was slightly squamous and infiltrated. The lesion covered the upper two-thirds of the right trigeminal nerve dermatome, involving half of the face with the forehead, the periorbital area, upper part of the cheek and the nose. The lesion became more marked after continuous topical anaesthetic and corticosteroid use. A standardized skin-surface biopsy was taken, and revealed a large number of Demodex folliculorum (38/cm(2)) in the lesion area. The lesions completely abated after topical 5% permethrin treatment, and no recurrence was observed during follow-up. Demodicosis may have atypical clinical presentations, other than the well-known classic forms. To our knowledge, this is the first unilateral trigeminal, pseudozoster presentation in the literature.