Alternate Names: Sacral dimple

Considerations:

The majority of pilonidal dimples are harmless congenital anomalies that consist of a small depression or pit. These may occasionally be associated with increased hairiness around the area. The pilonidal dimple may also be a deep tract, rather than a shallow depression, leading to a sinus that may contain hair. These can become infected and drain. On rare occasion the tract (sinus) may extend into the spinal cord.

During adolescence the pilonidal dimple or tract may become infected forming a cyst-like structure called a pilonidal cyst. These may require surgical drainage or total excision to prevent reinfection.

Common Causes:

• congenital pilonidal dimple
• congenital dermal sinus (of which the dimple is the mildest form)

Home Care:

Keep pilonidal dimples clean and free of debris during the regular bath. Report any drainage of fluid from the dimple, either clear or containing pus, to your health care provider.

Call If:

• you note swelling, redness, drainage or tenderness around the pilonidal dimple.

What To Expect:

The medical history will be obtained and a physical examination performed. In the vast majority of cases the examining physician will merely comment that your infant or child has a pilonidal dimple and that you should not worry. On the rare occasion when other findings may be associated you may be asked the following information:

Medical history questions documenting pilonidal dimple in detail may include:

• Has there been any change in the appearance of the pilonidal dimple?
• Has there been any drainage from the dimple?
• Are any other symptoms developing?
• What other symptoms are also present?
• Is there any numbness or loss of movement in the legs?
• Has there been any change in bladder control?

. If the lesion is an infected pilonidal cyst, surgery to remove the cyst may be recommended. Studies may be done to determine if the sinus extends into the spinal cord.

After seeing your health care provider:
You may want to add a diagnosis related to a pilonidal dimple to your personal medical record.