[header] How to treat scalp pimples [title] Use benzoyl peroxide. [step] Benzoyl peroxide is a common ingredient in acne washes and lotions. It works by killing bacteria that may otherwise clog pores to form new pimples. 
It also helps clear away excess oil and dead skin cells from the affected area. Benzoyl peroxide is usually found in strengths varying between 2.5 percent to 10 percent in over-the-counter products.