Pilonidal Sinus

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What is Pilonidal Sinus?

A pilonidal sinus is a small cyst that occurs in the cleft, the top part of the buttocks. Usually, a pilonidal sinus consists of hair, debris and dirt. It can catch infections and cause severe pain. With infection, it can ooze pus, blood and have foul odor.


This affects men in most conditions and is quite common in young adults, who sit for long hours and have no physical activities in their daily routine.


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When the process begins, there might not be any noticeable symptom but for a small dimple near the top part of the buttocks. If it gets infected, the depression might turn into a cyst or an abscess. A cyst is a closed sac filled with fluid, whereas an abscess is a swollen and inflamed tissue where pus gets collected. If you have an infection, the symptoms are:

* Low grade fever
* Swelling of cyst
* Pain while sitting or standing
* Reddened and sore skin around the depression
* Pus or blood oozing out from the depression
* Foul odor in the sac
* Hair protruding from the area
* Holes in the skin
* More sinus tracts over a period of time