With the clinical features and symptoms manifestations, it can be carbuncle, folliculitis, boil, abscess or impetigo. He may require antibiotics for the treatment which would need prescription from a physician.
Following may help you;
1) Warm compresses
2) Washing with the soap and warm water
3) Oatmeal lotion or over the counter hydrocortisone cream application
4) Advil or Motrin orally
Never lance it on your own.
Read the resource;
Please feel free for your follow up questions.
You are welcome.
Best wishes and kindest regards.