system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do pimples form and why are they so prevalent with teens going through puberty?
gpt
Your skin (particularly around the face, but not just there) is full of tiny holes called pores. Pores serve a variety of functions but the point of your question:

Pimples occur when the pore becomes clogged with dirt, oil, or an in-grown hair. Pimples are common in teens due to the excessive natural oils generated during puberty.