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Skin lesion aspiration

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

How the Test is 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. It may also be put in a lab dish (called a culture medium) and watched for growth of bacteria or fungi. 

How to Prepare for the Test

You do not need to prepare for this test.

How the Test Will Feel

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

Why the Test is 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.

Risks

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

References

Butler KH. Incision and drainage. In: Roberts JR, Hedges JR, eds. Clinical Procedures in Emergency Medicine. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2009:chap 37.

Update Date: 11/20/2012

Updated by: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.

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