When clogged follicles fill with bacteria, and they may rupture and cause severe acne. Your hands contain oils and dirt that can contaminate your pores, thus causing acne. The same is true of your hair. Your hair can contact your skin and cause acne. Tempting as this may be, it only makes matters worse.
Most zits heal on their own.
Picking at zits is a bad idea. It increases the chance of permanent scarring, spreads the bacteria and increases the chance for infection. Reduce stress wherever possible. Try more sleep, exercise, warm baths and general relaxation. Contrary to popular belief, diet has very little effect on acne eruptions, but a balanced diet contributes to physical well-being.