There are many different types of castor oil that can be used for moles. The type of castor oil you use will depend on the size, location and severity of the mole. For small moles, you can use a topical application of castor oil. This will help to shrink the mole and make it less visible. For larger moles, you may need to take an oral supplement of castor oil. This will help to reduce the size of the mole over time. If the mole is located in a difficult to reach place, you may need to use a special applicator or cotton swab to apply the castor oil.