is most likely
Thanks for posting on XXXXXXX
From your clear cut description, I will say he is having an abscess (probably still developing without pus). It will also be wise to rule out benign subcutaneous tumors
, such as cyst and adenoma
. Besides those, the rest are less likely to occur for a young teenage with no particular medical history.
I just he be placed on antibiotics such as cloxacillin
and antiinflammatory such as ibuprofen
for 5-7 days then reexamine after 5-7 days. If it is an abscess, pus will collect and can then be drained subsequently so that healing should be more effective.
If after 5-7 days the nodule is still firm and not collecting pus, I will suggest a fine needle aspiration and if nothing comes out, it will be best to refer the child to a surgeon who can have a proper look at the nodule.
Hope this helps and wish you the best.