How to pimples happen?

oil and dirt get caught up in your pores. Pimples develop when sebaceous glands, or oil glands, become clogged and infected, leading to swollen, red lesions filled with pus. Also known as spots or zits, pimples are a part of acne. They are most likely to occur around puberty, but they can happen at any age. During puberty, hormone production changes.

Explanation:

hope this helps got part of it off go.ogle

<3

:)

not sure if this what   you'r looking for would be percent composition