Pilonidal sinus or cyst is regarded as the small hole or channel in the skin. The Pilonidal Sinus is the form of cyst which is filled with the pus, hairs, dirt, and debris may lead to severe pain. It may lead to foul smelling discharge. Usually, Cab Drivers and Shop Keepers who are performing sitting jobs for long hours may be caught with the disease. This usually happens when the hair on the body pushes inside the body causing pain and dirt to push inside.