Benign proliferation of fibroblastic and myofibroblastic cells
Pathophysiology
Histology
- Very cellular, lots of mitoses figures, plump cells; stellate and spindle, tissue culture appearance, haemorrhage, mature towards periphery

Clinical presentation
- Young adults, upper extremity
- History of prior trauma at the site in 25% of cases
- Rapidly growing
- Superficial or deep
- Usually <5cm
- Usually circumscribed

Management
- None - reassurance, self-liming course