What is the treatment of pilonidal sinus?

Depends on extent. Depending on the extent, a variety of treatments are available. Many will heal on their own if small with conservative wound care and hygiene. Larger infected cysts may initially may require further opening to allow drainage. Recurrent cysts may eventually require complete excision with some of the wounds closed primarily whereas others may be left open to heal slowly over time. Some use flaps.
Infected? Abx will NOT cure a pilonidal sinus/cyst. They can help clear the infection and surrounding cellulitis that can occur when the cyst becomes infected.. ... but not the cyst itself. The cyst needs to be removed if bothering you. If not bothering you can be safely watched.
Time or surgery. A substantial percentage of pilonidals resolve spontaneously; but it takes a long time. If you don't want to wait, or the pain level is too high, surgery is the best option. It's a fairly simple operation, but usually done in the hospital. Be aware that recurrences are common, even after surgery.
Remove it. The sinus tract needs to be excised. Problems arise when the offending tissues are incompletely removed. This is typically done by a general surgeon.
Excision. It is very difficult to treat these kinds of cysts, without a radical approach, excising the cyst structure, and closing off the drainage. I have seen many patients over the years who have been treated less aggressively, and the problem only continues, with the patient getting very frustrated. It's not a huge operation, or very debilitating, but it should be done early rather than late.
Surgery. I think it's likely that the best way to treat a pilonidal sinus is with surgery.

Related Questions

What is the treatment for pilonidal sinus?

Initial treatment. Is antibiotics. If this fails, you might need local drainage. If this becomes a recurrent problem, surgical excision might become necessary.
Cleft lift surgery. The best way to deal with this is an operation that flattens the gluteal cleft and removes the sinus tract. This will get rid of the current problem, and prevent it from happening again. A properly done cleft-lift procedure (Bascom procedure) will accomplish this.
Infected? Abx will NOT cure a pilonidal sinus/cyst. They can help clear the infection and surrounding cellulitis that can occur when the cyst becomes infected.. ... but not the cyst itself. The cyst needs to be removed if bothering you. If not bothering you can be safely watched.