For most people, though, acne goes away almost completely by the time they are out of their teens. The type of acne that many teens get is called acne vulgaris (“vulgaris” means “of the common type”). It usually shows up on the face, neck, shoulders, upper back, and chest.
https://kidshealth.org/en/teens/acne.html#:~:text=For%20most%20people%2C%20though%2C%20acne,%2C%20upper%20back%2C%20and%20chest.