Reaching the Age of Adolescence

John and Radha were classmates since childhood. When Radha
became eleven years old, she developed a little swelling on her
neck. She visited the doctor who started medication for her. After
a few years, John also developed a slight protrusion on his throat.
He got worried and went to the doctor. But, the doctor assured
him that it was a normal feature in boys while they are growing
up. Can you think of any reasons for the difference in diagnoses?