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The article presents a case study of a 91 year old man with a rapidly growing tumour on his face, which had developed within the past few months. It was inferred that the patient was known to suffer from ischaemic heart disease and hypertension treated with aspirin, cilazapril, and metoprolol. Moreover, histological examination inferred a dense infiltrate involving the entire dermis, without involvement of the epidermis.

Pilonidal sinuses usually occur in the sacrococcygeal area in young men, and occasionally can be found in other ectopic sites. We present a retrospective case review on unusual locations of pilonidal sinuses in the past 4 years. The lesion sites were as follows: one on the penis, two on the scalp, two on the abdomen, one on the neck, two in the groin and two in the axilla. Abdominal and penile lesions are uncommon, but the other locations reported are unusually rare. To our knowledge, the groin has not been reported previously as a site of a pilonidal sinus, although the histological appearance of hidradenitis suppurativa may well resemble it. When trying to clarify the pathogenesis of these occurrences, we found that recurrent hair removal was a common characteristic of the patients we contacted, and this may have been the initiating trauma. [ABSTRACT FROM AUTHOR]