M.M.
Hi Atithi,
By chance, does either parent or other relative have more facial or body hair than normal? If so, this could be a heridity thing. I'm assuming not, because you probably wouldn't be so concerned if that were the case. Going to the endocrinologist is the right thing to do, and don't stop searching until you have an answer to it. His testosterone could be elevated which could cause this, or it could be something you would never figure out without professional help.
Don't take no for an answer. If your Mommy instincts tell you that something is wrong, it probably is. Good luck at the Dr.
M.