Hello,
From the symptoms it can be a boil, sebaceous cyst or swollen lymph node. Apply warm compresses on the bump and keep the area clean. Drainage of the bump is done only when it becomes soft and forms a head. Take some over the counter pain reliever and consult a doctor for examination and antibiotics prescription.
I hope it helps. Take care and regards.
ingrown hair with pus most likely. i usually pop them.