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Definition:
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Skin lesion aspiration is the withdrawal of fluid from a skin lesion (sore).
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How the test is performed:
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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.
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How to prepare for the test:
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You do not need to prepare for this test.
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How the test will feel:
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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.
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Why the test is performed:
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This test is used find the cause of a fluid-filled skin lesion. It can be used to diagnose skin infections.
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What abnormal results mean:
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Abnormal results may be a sign of a infection caused by bacteria, fungi, or viruses.
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What the risks are:
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There is a small risk of bleeding, mild pain, or infection.
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References:
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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.
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