pilonidal

pilonidal /pi·lo·ni·dal/ (-nīd´'l) having a nidus of hairs.

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pi·lo·ni·dal (pl-ndl)

adj.

Of or relating to a growth of hair in a dermoid cyst or in the deeper layers of the skin.

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pilonidal

[pī′lənī′dəl]

Etymology: L, pilus, hair, nidus, nest

a growth of hair in a cyst or other internal structure.

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pilonidal [pi″lo-ni´d'l]

having a nidus of hairs.

pilonidal cyst (pilonidal sinus) a hair-containing sacrococcygeal dermoid cyst or sinus, often opening at a postanal dimple, believed to result from an infolding of skin in which hair continues to grow. These cysts cause no symptoms unless they become infected, which is likely because of their location. Pain and swelling, with the formation of an abscess, are the symptoms of infection. Treatment consists of surgical removal.

Patient Care

. Postoperative care includes dressing changes and wound care to avoid contamination and promote healing. A lubricating laxative and an oil enema are usually given before the first bowel movement to avoid strain on the suture line. Patients are taught handwashing and toileting to prevent infection until the wound is completely healed.

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pilonidal

having a nidus of hairs.

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pilonidal sinus

see dermoid cyst.

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Patient discussion about pilonidal.

Q. What is pilonidal cyst?

A. A pilonidal cyst, also referred as sacrococcygeal fistula, is a blanket term for any type of skin infection near the tailbone. The condition is also referred as pilonidal sinus disease. It is usually painful. http://en.wikipedia.org/wiki/Pilonidal_cyst
This is a good site also:
http://www.pilonidal.org/whatitis.htm
Hope this helps.