Hi and welcome to HCM. Thank you for your query.
This is significant symptom and it should be evaluated and probably can be terated. It can be caused by hormial abnormality, testosterone
so first check these levels. Secondly it can be congenital testicle abnormality whic manifest later in life, some kind of criptorhism. YOu should visit urologist
because it can be surgically managed. Sometimes testicles can be excessively pulled back into abdomen by cremaster muscle.
WIsh you good health.