Ectopic Hidradenoma Papilliferum Dermoscopically Mimicking A Blue Nevus: A Case Report And Review Of The Literature

series of patients included eight women, all of whom were aged >70 years, infected by M. canis. Two of the patients were aged 93 years. When TC is observed in adults, the subjects are usually postmenopausal women. Qualitative and quantitative changes in sebum production, which facilitate the invasion by dermatophytes of scalp hairs, as well as alterations in the immune system have been suggested as possible predis posing factors. Furthermore, the literature suggests that TC is more common in immunocompromised patients and in patients who are using immunosuppressive drugs. However, none of our patients were using immunosuppres sive drugs. Our culture-proven series of cases of TC caused by M. canis shows the different clinical manifestations of TC in elderly subjects. Early diagnosis of this fungal infection in this population is challenging and requires a high level of attentiveness on the part of the medical practitioner. Therefore, we draw attention to a different form of dermatophytosis in elderly subjects in developed countries caused by zoonotic dermatophytes. If this condition is not diagnosed and treated properly, it may become epidemiologically important in the future.