If it has been present for a LONG time, it is
probably a lipoma. It is nothing more than a benign fatty growth. It
can be surgically removed to ease his discomfort.
If it relatively recent in origin then it could be folliculitis or a pimple.
A visit to the dermatologist should easily be able to solve your problem.
Do let me know if you have any more questions. Please remember to
ACCEPT the reply, a positive rating and a BONUS would be appreciated.
regards
Dr. Gupta