Pilonidal Sinus: Causes, Symptoms and Treatments Pilonidal Sinus: Causes, Symptoms and Treatments Dr. Abhijit Gotkhinde2021-06-01T11:15:31+05:30 A tiny tunnel or pit on the skin forms just above the buttock is Pilonidal Sinus: Causes, Symptoms and TreatmentsDr. Abhijit Gotkhinde2021-06-01T11:15:31+05:30