If he is well and the lump is not changing at all I would observe it. Look for increasing redness
or discharge, an increase in the size of the lump, increasing pain or a fever
. I'm not sure whether you can take a photo of the lump and share it on this forum but I would be happy to take a look. If it does get any worse, or over a period of seven to 10 days does not improve I would seek medical attention.