Sorry to hear about your problem. The spot is most likely normal pigmentation which occurs around puberty
(even in males) and is nothing to be scared or alarmed. If it is associated with a lump, then it could be gynecomastia
, which also occurs in males around this age and subsides on its own.
You should just monitor the lesion. If it increases in size, then you should consult a doctor.
Hoping for the best.