If your son is ten years or older, he is likely noticing changes happening in his body. Puberty is the time when testosterone begins to have obvious effects in his skin, muscles, and of course, his reproductive structures.
Your 9-10 year-old son is likely becoming curious about his boy body. He has entered puberty and has begun to notice changes.
This is a great anatomy figure from my book, I’m a Boy, My Changing Body. It shows that the testicles are located in a pouch of skin located outside the core of the body. The pouch of skin is called the scrotum.
One of the most important reasons I wrote my series of books for boys, and separately for girls, is to educate them about reproduction. From the first book written for 5-7 years old, through the next four books, I am carefully guiding their learning to achieve my mission.
As puberty begins, both boys and girls will notice a change in their skin because of the impact of rising testosterone in their body.