having a family history of the condition – more than one-third of people have a family member with the condition.having a deep cleft between your buttocks.a previous injury to the affected area of skin, for example from a fall.having an above average amount of body hair, which may be why more men are affected than women.age – pilonidal sinuses can occur at any age, but are more common in young adults between the ages of 20 and 40.Obesity – having a body mass index (BMI) of 30 or above When the skin is infected, the immune system (the body's natural defence against infection and illness) tries to fight the bacteria, which results in a collection of pus known as an The cleft between the buttocks is an ideal place for bacteria to spread, as it is often moist and warm. If a broken hair pushes into the skin, the skin becomes irritated, red and swollen. This may be caused by hair becoming trapped in moist, damaged skin between a hairdresser's fingers. There have been reports of hairdressers developing pilonidal sinuses on their hands.
This may explain why pilonidal sinuses are common around the buttocks, as sitting and driving will cause pressure and friction on this area. A broken hair may push into the skin, leading to an infection. If a hair follicle becomes blocked, it can become enlarged and then burst. It is thought that pressure and friction on a hair follicle could somehow damage it, causing a pilonidal sinus. Hair follicles are the small holes that an individual hair grows out of. There are several theories as to how this could happen.
It is generally thought they are caused by loose hairs that push into the skin. The exact cause of pilonidal sinuses is unclear.
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