You should avoid using a scrub on pimples. Scrubs can be irritating and make your acne worse. Instead of using a scrub, be gentle when washing your face and use a mild, non-comedogenic cleanser.
Exfoliation can be helpful for acne-prone skin because it helps slough off dead skin cells and makes the skin look smoother. However, using a scrub can irritate inflamed skin and exacerbate acne breakouts.
While there are scrubs designed for acne-prone skin, they often contain harsh ingredients that can further irritate your skin. It's best to stick to gentle cleansers and consult a dermatologist for personalized advice on managing your acne.