The cause of acne pimples is oil and dirt buildup in pores that become infected and turn into cysts.
Witch hazel is a good product to use after cleansing and exfoliating the face because it closes pores and prevents oil and dirt from getting trapped inside. It also kills bacteria that might be on the skin.
Every morning and night, I use a hot towel to open my pores. Then, I wash my face with a gentle cleanser to remove dirt and oil. The third step is witch hazel to close the pores and finally, I apply an oil-free lotion. I also exfoliate my skin in the shower three times a week.
This routine has worked great for me, I rarely get acne nowadays, only during my period due to hormonal changes.