Thanks for writing to us.
You seem to be having acne
which usually begins in your age.
To keep your skin clean
Use a face wash meant for oily skin like neutrogena
gel and adapalene
gel over acne lesions or bumps
Use a mild water based moisturiser
If having blackheads or whiteheads, use a comedone extractor to remove these.
Exfoliate your face once a week.
As you are too young, you may take your mother's help to follow these suggestions