Skin lesion aspiration

Skin lesion aspiration is the withdrawal of fluid from a skin lesion (sore).

How is the Test Performed?

A needle is put into skin sore or skin abscess, which may contain fluid or pus. The fluid may be examined under a microscope. A sample of the fluid may also be sent to a lab. There, it is put in a lab dish (called a culture medium) and watched for growth of bacteria or fungi.

Preparation for the Test

You do not need to prepare for this test.

The health care provider may inject a numbing medicine (anesthetic) into the skin before inserting the needle if the sore is deep.

You may feel a pricking sensation as the needle enters the skin.

In many cases, removing the fluid will lessen pressure within the skin sore and ease pain.

Why is the Test Performed?

This test is used find the cause of a fluid-filled skin lesion. It can be used to diagnose skin infections.

What Abnormal Results Mean

Abnormal results may be a sign of a infection caused by bacteria, fungi, or viruses.

Skin lesion aspiration Risks

There is a small risk of bleeding, mild pain, or infection.

References

Ruocco E, Baroni A, Donnarumma G, Ruocco V. Diagnostic procedures in dermatology. Clin Dermatol. 2011;29:548-556. PMID 21855731 www.ncbi.nlm.nih.gov/pubmed/21855731.