Hi. Welcome to HCM
normal healing time for pilonidal surgery is 3-6wks.The presence of discharge indicates infection.Your infection might not have cleared & there is every chance that the site might now be also infected with anaerobic bacteria.These anaerobic bacteria are present in intestines(also at other sites) & frequent cause of deep abscess
.The discharge due to anaerobic bacteria will be foul smelling.These are readily sensitive to metronidazole
.please consult your clinician,if possible get a culture & sensitivity of sample done(for pathogen).