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Skin lesion aspiration is the withdrawal of fluid from a skin lesion (sore).
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.
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, the removing fluid will lessen pressure within the skin sore and ease pain.
This test is used find the cause of a fluid-filled skin lesion. It can be used to diagnose skin infections.
Abnormal results may be a sign of a infection caused by bacteria, fungi, or viruses.
There is a small risk of bleeding, mild pain, or infection.
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.