Before going to bed at night, wash your face with Dove soap and warm water. Dry, then apply benzoyl peroxide 5% (Oxy 5 or a generic) all over the areas where pimples occur.
In the morning, again wash with Dove, dry, and then apply salicylic acid 2% (Neutrogena Rapid Clear Acne Lotion if you want a moisturiser, Oxy paRAB if you want somthing light and dry) all over