Aneurysmal Dermatofibroma: What to Know

This is a distinctive form of dermatofibroma, a growth arising in the skin's supportive tissue. Blood-filled spaces within it may give the bump a blue, purple, red-brown, or dark appearance. It can feel firm, may enlarge, and can sometimes become tender or bleed after minor trauma.

Appearance alone may not separate it reliably from a vascular growth, a pigmented mole, or a more serious skin tumour. A dermatologist examines the lump and its history; confirmation often depends on removing a sample or the whole lesion so a pathologist can examine the tissue under a microscope.

Arrange a dermatology appointment if the lump has not been diagnosed. Note when you first saw it and whether its size, colour, surface, discomfort, or bleeding has changed. A clear photograph with a date can help document evolution, but it cannot establish the diagnosis. Avoid squeezing, cutting, or repeatedly picking the area.

A stable lesion confirmed as benign may only need observation. If the diagnosis is uncertain, the growth is troublesome, or removal is preferred, surgical excision may be discussed. Excision leaves a scar, and the clinician can explain how the lesion's site and depth influence the procedure.

Seek a prompt assessment for rapid enlargement, repeated bleeding, an open sore, increasing pain, irregular colour change, or a lump that looks notably different from your other marks. Apply steady pressure with clean gauze if it bleeds. Urgent care is appropriate when bleeding is heavy or does not settle with continued pressure.

Ask which features support the suspected diagnosis, whether a biopsy or full excision is more suitable, what scar to expect, and how results will be communicated. If observation is advised, clarify which changes should trigger another visit.