Abstract
Pilomatrixoma is a benign, asymptomatic skin tumor that forms from hair follicle matrix cells. Most are under 3cm in diameter and occur on the head, face, or neck. Bullous appearance is very rare in pilomatrixoma. In this case report, we present a case of bullous pilomatrixoma of unusual size, region, symptoms, and patient age. It had been misdiagnosed as a keloid and as dermatofibrosarcoma protuberans. Early treatments were ineffective. The patient approached our outpatient facility and underwent excision. He was then diagnosed with pilomatrixoma by pathological examination. The clinical appearance of this case was quite difficult to diagnose, even MRI and B-ultrasonic examinations provided limited diagnostic evidence. Given the revelations from this case, we reemphasize the importance of performing a biopsy (if patients refused operation or preferred conservative treatment) before any invasive treatment to minimize economic or time loss of patients who have difficulties in diagnosis.
Published Version
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