Hi,Welcome to HCM. You need to confirm its cause and nature.In my opinion it seems to be Pilonidal Cyst with infection?
abscess, lately,as it is with shooting pains lately and with 4 yrs past silent history.
Second Opinion from surgeon would rule out other causes from Boil with abscess/Sebaceous Cyst with abscess.
Remedy-
Cold fomentations
Tab
Motrin Tab oflox with
Metrogyl.
I & D if no regression after antibiotics
If Pilonidal Cyst with abscess,
drainage and elective coccyx excision.
Hope this would help you to resolve your query.
Else Contact with a Followup Premium question to ME.
Will appreciate your Hitting thanks and writing excellent review comments to help needy patients like you.
Welcome with any other further query in this regard.
Good Day!!
Dr.Savaskar,
Senior Surgical Specialist
M.S.Genl-CVTS