Pilonidal sinus has a high recurrence rate (despite how good a surgery is done) as the perianal skin always has hairs
The best way to prevent recurrence is to regularly shave off the area.
Next Steps
now that you already have a recurrence it is better to get a surgery consultation
Health Tips
Go for a plastic surgeon consultation.
the surgery with least recurrence rate is the one where the entire sinus tract is removed and the raw area is covered with a flap
if you have not undergone this already , please follow what i have said above
I hope this helps you