Branchial Sinus
During development a sinus or tract (tube) can be left behind opening in the neck and sometimes commmunicating with the throat.
Most are in the upper neck and may end near the tonsil. These may need two small incicions to remove but are unlikely to recur. Those lower in the neck can end lower in the throat and are more likely to recur. As with most surgery the best chance of success is on the first surgery so it is important to have a surgeon who is experienced in this type of surgery