Hi Welcome to HCM, I appreciate your concern for the infected wound near coccyx. Features are suggestive of recurrent infected pilonidal sinus. As many as 50% of the surgically removed pilonidal sinus recurs. Early recurrence is usually due to failure to identify one or more sinuses at the time of incision and drainage. Later recurrence (more than six months after surgery) is usually due to tension in the mid line cleft and a secondary infection caused by further build-up of hair or other debris. Recurrences have been reported as late as 20 years after the surgery. You are advised to visit your treating surgeon for further evaluation and incision and drainage of the abscess. To prevent both the both short-term and long-term recurrence of the condition Laser hair removal from the affected area is found to be effective. Hope this suggestion will be useful to you. Wishing you good health.