Acne/pimples are very common in teenagers and can involve not only the face and neck but the trunk and back aswell. However, in females we may have to understand if there's any hormonal role. Hence, I would recommend for you to rule out such causes after a thorough examination. Also, the treatment varies depending on the severity and type.
Next Steps
Should go for a consultation
Health Tips
Do not scratch or pick at the pimples. They may cause more scarring if you do so.