Pilomatricoma, also known as Pilamatrixoma or Malherbe\'s calcifying epithelioma, is a benign skin tumour with a bimodal age distribution between the paediatric and elderly age groups. Although it was previously thought to be rare, recent studies have revealed that it is quite common. Typically, pilomatricoma is diagnosed following histopathological examination of the lesion as it is frequently misdiagnosed with other types of skin pathology. In our case, the child presented with painless swelling of the left infraauricular region. The initial cytology and imaging were unable to provide a definite diagnosis. An excision biopsy was done, and a histopathological examination was suggestive of Pilomatricoma. Therefore, Pilomatricoma ought to be considered in the differential diagnosis of head and neck lesions in hopes of providing a better understanding on this pathological lesion.

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BACKGROUND: A pilomatrixoma is a benign appendage tumour related to hair cells matrix. Most of the literature review about pilomatrixoma is in the form of case reports with fewer cohort studies. The objective of this cohort is to study the variable demographic characteristics, presentation and histopathology of this condition among a larger group of patients.
METHODS: We conducted a retrospective study of patients who had excision of pilomatrixoma between February 1998 and August 2011 in a District General Hospital in UK.
RESULTS: The study included 67 patients with histopathologically diagnosed pilomatrixoma. The mean age was 32 years. Male to Female ratio was 35:32. The average diameter of the lesion at presentation was 13 mm (range: 2-30 mm). 66 of 67 (98.5%) patients presented with solitary lesion, while 1 patient (1.5%) had two lesions.
CONCLUSIONS: Pilomatrixoma is not an uncommon benign lesion. It is more common in the maxillofacial area.