Epidemiology
A benign, fast-growing lesion that affects young and middle-aged adults. Its rapid growth can mimic sarcoma, but many lesions are small, superficial, and self-limiting.
Basic features
It can be alarming because of how quickly it grows, but it is usually small, superficial, and self-limiting. Most cases carry a rearrangement of the USP6 gene, a test that helps confirm this is a benign lesion and not a fast-growing sarcoma.
Usual treatment
A biopsy or limited excision is performed if there is any doubt; some lesions can simply be observed once the diagnosis is confirmed.
Outcomes and prognosis
The outlook is excellent, and many lesions do not come back after a biopsy or simple removal.