Final answer:
Acne is a skin condition caused by hormonal changes during adolescence and can also be influenced by diet. It causes pimples and is common among teenagers.
Step-by-step explanation:
Acne is a skin condition that causes pimples and is one of the more common skin problems among teenagers. It is primarily caused by hormonal changes that occur during adolescence, which can result in overproduction of sebum. Consuming a diet high in refined sugars or carbohydrates can also lead to acne.