Chronic interdigital pilonidal sinus caused by dog hair.

We present a male patient in his early 70s with a cyclical 20-year history of a nodular papule affecting the left forefoot. On examination, ginger red-coloured hairs were evident within the sinus tract, correlating with the patient's short-haired Hungarian Vizsla dogs. Histology confirmed the diagnosis of pilonidal sinus. The patient was referred to the orthopaedic department for surgical intervention. Interdigital pilonidal sinus is a rare phenomenon which has been described as an acquired occupational hazard; however, this case report will highlight the importance of clinical history-taking including pet ownership when assessing a patient for the first time in a clinical setting.