So many things can cause random breakouts, most of which are out of your control. The only thing you can do is continue washing your face at least twice daily, once in the morning and once in the night. Be sure not to over wash as that can cause your skin to become dry which will trigger an over production of oil and worsen your acne. Good luck to you!

Im thinking stress? Hows your stress levels been. The person above is right about it being many factors and no matter how well you take care of your face, they can just happen. Maybe hormonal acne connected to your period? Try to not freak out too much and dont touch them. That will just make them bigger and stay there for much much longer.