Hello & welcome,
Getting wisdom tooth extracted is itself a somewhat extensive procedure than a normal tooth extraction. It is usually associated with Post operative pain, swelling & tenderness in the area of extraction.
Swelling after third molar extraction subsides within 7 - 10 days after the procedure. But if it persists even after that, then wound needs to be clinically examined by your dentist
Development of lump over the extraction site is also a normal part of the healing process which resolves gradually over the period.
It can be due to infection in the wound but this is less likely in your case as you are not having substantial amount of pain.
Avoid touching the lump with your fingers if the wound is recent to avoid getting it infected otherwise. It can be considered as normal healing pattern by the body & should not require any treatment unless painful or infected secondarily.
Always keep your oral cavity clean especially in the wound area. Accumulation of food debris in the same area should be avoided by the use of proper brushing or using antiseptic mouthwash gently.
Antibiotics may not be needed in your case as there is no sign of pain and inflammation or infection.