Using a body scrub can prove to be magical for your skin. The exfoliating powers of a body scrub can remove the dead skin cells and make your skin silky smooth to touch. However a body scrub may not have that fantastic result always. Sometimes it can do more harm than good especially when you exfoliate too hard but according to dermatologist Dr Sejal Shah here are a few situations when you should skip exfoliating. After using skin lightening agents: Skin lightening agents targeted to treat hyperpigmentation can irritate your skin so using a body scrub can make things worse.