by Jason Wasserman MD PhD FRCPC
April 21, 2022

What is a poroma?

Poroma is a non-cancerous type of skin tumour. The tumour develops from sweat glands normally found in the skin.

This picture shows a poroma arising from the surface of the skin.

Where are poromas found?

Poromas are commonly found on the palms of the hands, soles of the feet, and extremities (arms and legs), however, other sites can also be involved.

How do pathologists make the diagnosis of poroma?

The diagnosis is usually made after the entire tumour has been removed in a procedure called an excision. The diagnosis can also be made after only a small part of the tumour is removed in a procedure called a biopsy.

What is a margin?

A margin is any tissue that was cut by the surgeon in order to remove the tumour from your body. A negative margin means there were no tumour cells at the edge of the tissue. A margin is considered positive when there are tumour cells at the edge of the tissue. A positive margin is associated with a higher risk that the tumour will grow back (recur) in the same site after treatment.


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