It depends on the size of the abscess and state of the abscess (solid/semisolid/ liquid).
If it is small size and semisolid state it will subside with antibiotics alone.
If it is bigger in size and in liquid state you may need surgery (incision and drainage).
Next Steps
Measure the size of abscess.If it is more than 4 cm and liquid state better to go for Surgery.
Health Tips
Consult doctor if the abscess is associated with local signs ( Redness, Local rise of temperature,pain ).