For recurrent pilonidal cysts, factors like hormones, friction and infection are equally important. In your case, either it was more than one pilonidal sinus leading to chronic pilonidal disease or it was due to reinfection in neighbouring hair follicles or chronic infection from entry of hair or debris into a postoperative wound leading to complex or recurrent pilonidal disease.
Surgical management of chronic and recurrent disease is controversial. Numerous studies have been put forward advocating one treatment over another but none has been proved better than the others. Presently, the various methods used are incision and drainage, excision and healing by secondary intention, excision and primary closure and excision with reconstructive flap techniques. Please discuss these options with your doctor.
Hygiene, proper dressings after surgery and depilation is the only ways to prevent recurrent pilonidal sinus. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.