I just found out i have a brochial cleft cyst on my neck and i was wondering, does every case need surgery for removal or can it just go away?

Depends: They are congenital ( you are born with ) , smaller malformation will not give any trouble , most of the time they drain out give infections to the sinus tract and have very low incidence of malignant transformation Speak to your doctor. Removal is low risk surgical procedure .

Branchial cleft cyst: Branchial cleft cysts/sinus/fistula are congenital conditions which can have various presentations. In general branchial cleft cysts are condictions that typically present with neck mass or swelling. Occasionally they can present with infection. They often do require surgical removal as with time they can enlarge or become infected. Surgery is generally outpatient