Pilonidal disease or Pilonidal sinus is common but umbelical Pilonidal sinus is a rare occurrence.
Male have more disposed to get this than female.
Sorry to hear that you have got this.
Conservative treatment can be given & may help too.
Reconstructive surgery can be done wherein normal therapy fails.
You can give a try to Homoeopathy, which can really help you in conservative treatment.
But, we Homoeopaths need to about the person suffering from an ailment, than just go by diagnosis of the disease & name of the disease.