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

A needle is inserted into a skin lesion or skin abscess, which may contain fluid or pus. The fluid may be examined under the microscope or placed in a special laboratory dish (called a culture medium), where it will be watched for the growth of microorganisms.

There is no special preparation for this test.

If the abscess is deep, the health care provider may inject a numbing medicine (anesthetic) into the skin before inserting the needle.

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

In many cases, the removal of fluid will decrease the pressure within the irritates skin sore, and relieve your pain.

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

Abnormal results may be a sign of a bacterial or fungal skin infection.

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

Updated by: Michael Lehrer, M.D., Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.