Pilonidal means a tuft of hair and Pilonidal sinus is an infected cyst filled with pus and hair at the bottom of the coccyx bone or at the hairline between the buttock region. Occurs most likely in males than females. What causes Pilonidal sinus ? The exact cause is still unknown. It is believed that it’s caused due to prolonged sitting, traction with clothes, in hairy people and could be hereditary. Symptoms of Pilonidal sinus * swelling along with severe pain and redness * Pus drainage, sometimes along with blood * Tenderness * Fever * Recurring often if not treated When should you consult a doctor ? When you see 2 or more of the above symptoms altogether. Treatment by MAC : Mac successful treats PNS with combinations of kshara sutra and kshara karma. Mac have treated more than five hundred cases with 100% success rates.