A pilonidal sinus is a small cavity or tunnel in the skin, typically found near the upper part of the buttock crease, just above the anus. It often contains hair, dirt, or debris, which can lead to inflammation and infection.

Pilonidal sinuses are most common in young adults, particularly men, and individuals who sit for extended periods, such as truck drivers. Risk factors include obesity, excessive body hair, and a family history of the condition.

Symptoms can include pain, redness, and swelling near the affected area, as well as pus or blood drainage from the sinus. If infected, it may cause fever and a general feeling of unwellness. In some cases, the condition remains asymptomatic until an infection develops, resulting in a painful abscess. Left untreated, the infection can spread and cause complications.

Treatment varies based on the severity of the condition. Mild cases may improve with home remedies like warm compresses and proper hygiene. If an infection is present, antibiotics may be prescribed.

For more severe or recurrent cases, surgical options such as incision and drainage, excision, or laser therapy may be required to remove the sinus and facilitate healing.

To prevent pilonidal sinuses from developing or recurring, it is essential to maintain good hygiene and avoid prolonged periods of sitting.