A doctor will examine the swelling carefully, because any lump on the neck should be checked by a professional to rule out other causes.
If it is a cyst, the doctor numbs the skin, makes a small opening, drains it and removes the sac so it is less likely to return.
The area is then cleaned and dressed. Keeping it clean, avoiding shaving over it for a while and following the aftercare advice helps it heal neatly.
Using a clean, sharp razor, washing the neck daily and not squeezing bumps all help prevent new cysts in this area.
Keep your chin up and get it checked. The videos below show neck cysts being treated by professionals.