Castor oil has anti-inflammatory properties that can help reduce the moles. According to Dr. Paul Yamauchi, MD, PhD, a surgical dermatologist, the smell can irritate the moles. He says, “Moles typically dislike castor oil due to its strong odor and taste, which can be unpleasant for them. Additionally, castor oil has natural properties that may irritate moles, causing them to retreat and eventually disappear over time.”